Bitcoin might have failed by then... or maybe the fiat economy will have and 1btc will be worth thousands  . I think 100 bitcoins would be a nice amount to have and hold, though. I think bitcoin will hopefully go back to 1k again at some point and depending on where you live 100k could make your life very comfortable. I know I could survive off that for probably 50 years if you only have to pay rent and food etc. Pesonally I wouldnt set myself goals and just keep a nice amount in btc but one you could afford to lose as nothing is certain.