quite possible it won't last forever as we see it now. It might transform in some more advanced form, move to the next level. No worries about it.
Technologies are being updated and developed almost everyday, it is really possible this will happen.
A lot of known people said that Bitcoin is just a bubble, a bubble that one day will explode and it would also not stick for long as well, as they said it, it is a bubble and bubbles don't stick that long. For me, with some supporters making their moves to lengthen the life of that bubble, we can prove that they are wrong. If they don't want to invest just let them be, we have our own, they have their own.