Nothing in this world is permanent, and that's going to include Bitcoin. I'm sure it's going to take more than a dozen lifetimes for something so great to be invented that could potentially replace Bitcoin though.
bitcoin will indeed still exist but don't let you fall for this. Don't just stick to bitcoin and forget about everything else.
try to do other things like research other coins if it is profitable. because here there is not only bitcoin but altoin there are also some coins that I feel are profitable.
bitcoin is good and the potential is very bright but it would be better if you do things like I said above because this will be useful for you in the future. so that if bitcoin crashes and declines as it is now, you still have other assets aset
I agree with you that Nothing is permanent in world, but I don't think Bitcoin will crash anytime sooner. Is gaining popularity everyday, and it will stay for sometime. Although, is still advisable for us to invest in other coin, there are many more other coin which will have high value in the future.