User Economics
Now we will switch to the investor point of view. A majority of users treat BTC and BCH as a store of value. Most are investing hoping that the value of their investment will increase over time.
Whether you can afford to invest 100 dollars or 1 million dollars it probably represents a significant part of your wealth and you want to invest it as wisely and as safely as you can.
So these are the questions you should ask
1) "Can miners leave the chain you want to invest on?"
The answer to both BTC and BCH is YES.
2) "What happens to the chain in question if miners leave?"
The explanation is above. On the BCH chain nothing much. It will slow down awhile but will adjust and get back to normal. However on the BTC chain it is possible and not a non zero possibility, that the chain could come to a grinding halt and become unusable.
It is your hard earned money so the thought of it being subjected to loss, even if it is only a small chance, should sway you to the safer choice or not invest at all. If you are investing for your family and friends or your investors, the question of risk and safety becomes more acute as reputations and legal implications are involved.
3) What happens if you are already invested and you just found out about this existential risk?
If it is your own money you could decide to accept the risk and remain invested. However if it is not your money then you have a legal duty of care. You have a fiduciary duty to make sure that the funds you are entrusted to look after are safe. You have been made aware of the risk, and even a small amount of known risk cannot be acceptable for you legally. If you are invested in BTC, you will be waking up everyday checking BCH prices, the mempool and difficulty and mining profitability, to see if any miners have or could possibly leave initiating the Chain Death Spiral.
If you are invested in BCH you have peace of mind because the dreaded Chain Death Spiral is not a possibility.
4) What would you do if you are heavily invested say hundreds of millions or billions and you decided that the risk is unacceptable and you need to get out?
If you had both BTC and BCH at the time of fork then your position is neutral.
If you have sold your BCH allocation or if you invested in BTC after the fork, it gets interesting. Because if you were to sell quickly you will crash the market. So you will need to do it slowly and at the same time keep the conditions as "normal" as possible until you exit completely. To do this you will have "manipulate" the market directly or through user forums, to keep the BTC price high and the BCH price low until you exit your positions.
Wonder why the BTC price is so high and bullish. It is not just because of demand and the selling of BCH to buy more BTC but those that did, now have a mission to keep BTC prices high with rosy predictions like 5000 and 25000 soon. They are now bias and invested in BTC price staying high. Be wary.
Conclusion
Do not be fooled. By now the people invested know what is happening. Before the fork it was hard to see. But now they can clearly see the implications and how events will unfold and play out. Some will see it before others. Some will take advantage of what they see to make a profit. Arm yourself with knowledge so as not to be caught at the wrong end of the stick.
There is a continuing competition for the services of miners to secure their chain. In this scenario the BTC chain always carries the possibility of going into a Chain Death Spiral. The BTC chain is doomed because it does not have the protection of EDA and the problem is magnified by the 1MB limitation. It is only a matter of When and not If.
How do you know if I am not favoring one side against the other?
I am telling it like it is. I am not comparing the technical merits of each technology or the capabilities of their developers. If the chain fails these merits do not matter one iota. The fact is one side, BCH has immunity against loss of hashing power. The other chain does not, When the "disease" hits, the chain without the immunity will get "sick" and can even die. When it does the chain that survives, BCH becomes the new "Bitcoin". This is the reality.
So why can't the developers of the BTC chain program in EDA or something similar?
It is a hard fork! And therefore not really in their control. It took nearly 4 years to get BCH to hard fork to bigger blocks and only really made possible because a soft fork UASF threaten to split the chain. The miners promised to support and not to attack the new BCH chain as insurance and security against UASF to which they were oppose. It is actually an unexpected bonus that the BCH chain has immunity against the dreaded Chain Death Spiral, and only because that protection was built in from the outset out of necessity.
Source - bitcoinandtheblockchain.blogspot.com
