First, bitcoin isn't going anywhere short of an EMP.
And even then it's probably not going anywhere for areas unaffected.
That said, let's pretend some coinX shows up and kicks all kinds of ass in the crypto world. You've sunk countless thousands into bitcoin...omg what do you do?
If coinX looks like it's going to overtake bitcoin, then cash out and invest in coinx down the road. Don't scare yourself from the wealth ride up just because you're overthinking the future. What happens if you wait for coinX and miss bitcoin all together?
People bought stock in myspace...then facebook and twitter came along. If those people were smart, they moved on. If not, they left it all with myspace...which is still around, but it's not facebook.
Second, the better analogy is fiat = myspace. bitcoin = fuck those guys...
(btc would be facebook, if I just have to do this one...but it makes me feel dirty)