Yes, bitcoin is bitcoin forever. As long as there are many people who are using bitcoin then bitcoin will be forever. And also, as internet exists then the use of bitcoin will still continue even up to 20 to 50 years more.
Forever is a big word. Bitcoin may be around and rise in value even more but surely there's going to be an end to it one way or another. It may evolve, it may be replaced, the bubble may pop and btc may crash, we can't really say