I do not think I should buy Bitcoin now. Please wait for the bitcoin price to fall down then buy.
Yes, keep waiting longer so you'll eventually end up paying a significant premium over current levels.

That's exactly what happened with people that were even waiting for the price to fall down at the time we just broke through the $1000 level again -- look where we stand in today's time. At this point the only thing you can hope for, is that the SegWit2x hard fork will cause so much panic in the market, that it will trigger people to sell. But then again, if we look at another likely possibility, then we have to keep in mind that people might end up buying more BTC to end up with more S2X. In other words, even the SegWit2x fork might not result in the market to tank initially.