of course it is, think about other currency it survive more than hundreds of year, because it is useful, it is used for our daily life. so if it was still using after 100 years probably it is still alive and survive. i cant imagine how much the value of it, but sad to think i dont know if im still alive when it reaches 100 years. lol
You're right, maybe 100 years later we're gone, but we believe Bitcoin can be a new payment instrument.