Some people still asking bitcoin is the same as the tulip bumble.
I don't know where you've been hanging out but I haven't seen anybody ask this in years!
Tulip is a non-tech bubble and BTC is a tech bubble.
There is no bubble in bitcoin.
we can predict this has to be in another 100 years.
No we can't. The way technology is developing the gaps between massive innovations that revolutionize the world is decreasing so we can't predict what bitcoin is going to be like in 100 years from now.
We can only predict the short term. For example we know that for the coming decade or two bitcoin will dominate as the only decentralized currency.
There is another valid point that the last BTC going mined in 2140 or near year so for that period BTC should survive.
Again you can't make that prediction and your whole reasoning is wrong. Bitcoin doesn't survive based on its block reward.