Would you buy more Bitcoin?
Personally, I wont hold for too long when it is confirmed that price will not go beyond certain point and eventually this is what will happen in the long run when the penetration of bitcoin would have reached a point where everybody now holds and uses it by then, only major events will cause shift in price level. But that does not mean bitcoin would thereafter be useless, it would mean it would then function as measure of value and and medium of exchange rather than store of value which is mostly used for in today's world since it expected to increase in other to generate more income.
However, this also comes with its own advantage because it then mean a lot of organisations, credit rating agencies, multi-nationals, insurance houses etc can then rely on it to make their own financial decision since volatility is to the barest minimum.