I would say that I will still invest into Bitcoin if the 10% annual return would be consistent. Well, I know that it will not be because whenever we enter the bear market, so does most of the asset classes. If this happens though, I will have to recalculate and readjust my overall portfolio. Instead of putting more into Bitcoin or cryptocurrency in general, I would put more on Stocks that are giving dividends annually because that would be much safer at least. 10% is still a high increase considering how much other asset classes like stocks, bonds and others are giving on a yearly basis.
Well, I know that this is hypothetical only like you said OP, and we know that this will not happen... or at least not in many years because of the speculative feature of it that you said already.