Even if this possible scenario were to come true, wouldn't there be a way to profit from such scenario, rather than going away for "a couple of years"?
Wouldn't we want to attempt to buy more on the way down to the bottom in early to mid 2019? And of course, there might be other actions that can be taken, too.
Yes, thats the theory. Very few ppl would be able to successfully call the right timings and price. ..but good luck to anyone that goes for it.
Not tying to put ppl off, just pointing out that passive hodling is the safe strategy: you only have to make one correct call , and that is 'The price of BTC is still in a long term uptrend' (could just possibly be wrong, but the odds are at least in your favour).
The reality is that only a minority actually make much profit from trading, most is made from hodling.
Largely, I agree with you, and what you are saying also seems to justify a continued dollar cost averaging (DCA) investment plan, because such DCA plan presumes long term up, and does not attempt to put too much weight into short term ups and downs that are difficult to figure out or get even close to correct.
Yet I am not sure whether listening to a prediction like yours some folks would attempt to tweak their dollar cost averaging strategy because they are kind of waiting for lower BTC prices or something like that or maybe not buy as many BTC when the BTC price goes up in order to buy more when the price goes down as they are projecting to happen.
In the end, perhaps some little tweaks to DCA are not going to hurt too much as long as the tweaks don't become large attempts to time the market.. that then rise to more of a gambling technique instead of DCA.