Honestly i might be forced to do same too, if it stops serving the purpose i choose it for then switching to another good option is the best thing to do.
personally, i wouldn't invest in btc either if its price just stayed flat.
But at the moment it does not seem that it is possible to create something better than Bitcoin or that something better than Bitcoin can be created.
I agree with all of you, and everyone is here for profit, but there is a difference between this and other investment opportunities that could take over, as many came after gold when gold flatlined, but it does not mean they left gold. And I also did not say I would leave it completely, but partly I have to because I want volatility in the asset or demand that can make a profit, and there is loss too, of course.
But if Bitcoin flatlined like gold, many of us would still buy it and would not sell because it can still move up and down.
I might hold some in it too, but if Bitcoin were to flatline like gold, then which investment would we choose in that phase? Haha, that's a different question. Of course, I would put more into gold and less into BTC because gold has a stronger base than BTC in that phase, hypothetically speaking.