I really hate when some people say that bitcoin has no value at all. OP is correct that time will make bitcoin very valuable. The paper money was perceived to be valuable so we can also do it with bitcoin.
Do not hate it take advantage of it, all of those people that say something like that are people that are not going to invest in bitcoin until it is too late, you can take advantage of it by buying more bitcoin that way the share that they should get will get lower, this and return will drive the price even higher and this will benefit you in the long run.
No one can tell exactly what will happen after this much period as things will be changed very much significantly by then and that we will then be seeing a much different world.
The only thing which I can sense is that by that time, the number of investors investing in crypto currencies, the awareness rate of the crypto currencies amongst the people as well as the demand and the market value of the crypto coins will be much more than it is at present.