I do not think I will buy bitcoin if the price reaches $ 100k, because it is very expensive and I should look for bitcoin through signature campaign. In signature campaigns by getting bitcoin will be very profitable and I will start investing after I get bitcoin.
Those who knew bitcoin as this moment may no longer buy if ever such amount reach, we may think it too high, and just regret decision of no buying it now, but newbies by that time may still get attracted on its price since they will see proofs on old users who earn thru btc investing.
I am sure the reason why a lot of people say this is because we do not really have the funds to buy as much as we would have loved to but not like we cannot buy.
Earlier this year, 0.1BTC was really not worth that much but now it is worth a lot and I am sure, some people may have been looking for 1BTC instead of doing with what they can afford and I am sure no one would have done it differently even in 2010. At least, it is good that the community is full of plenty means to earn as much as anyone can, so the ball is in everyone's court.