I have 100% trust that Bitcoin will stay for a very long time despite people doubting it. It has emerged as a perfect solution for the current economic crunch. Relying on fiat currency alone will not help so much but with bitcoin and its technology, I hope economies will stabilize.
I will be using bitcoin to 30-40 years in the future and I also believe bitcoin can last up to 40 years at least. the development of technology is always growing rapidly and currently all the technology has always been at the forefront. so bitcoin will be great in the future with the technology of the currency which is better than anything.
30-40 years is a really long time to make speculations about.
Many changes will need to be made to the bitcoin technology to help it survive for the next 10 years.