There's no assurance that bitcoin will stay on top, but we have a lot of good altcoins and I believe crypto world will continue to exist in the future. For now, we have to support what is very popular and valuable and that is bitcoin.
Yeah i couldn't agree more with you and the simplest ways to keep supports bitcoin is stay use bitcoin until future. If there is still people enthusiasts with bitcoin , bitcoin will keep exists until the future. That actions is easy ways for bitcoin users to keep supports bitcoin as well.