Our world changes constantly and if you want to move with the times and to progress along with the rest of society you should accept bitcoin. No problem in using usual money as well as digital currencies if it gives you comfort. If bitcoin disappears it doesnt mean that fiat money will grow.
yes you are correct change is inevitable and there is nothing we can do to stop it. It is either you accept the changes or continue to dwell in the past. But I don't see money disappearing, instead I see it go hand in hand with bitcoin and cryptocurrency. Money has been used for so long and has established a lot to just disappear.