Bitcoin cash may reach single digit when new coin introduce after next fork
SegWit2X is probably deleterious. It splits the SegWit supporters probably causing some of them to fight each other and/or confusion. (getting them to split their mining resources probably helps with any future attack on one of the two forks)
Bitcoin Gold is not Bitcoin at all. It changes the proof-of-work algorithm which means it has no mining cartels of significance behind it.
BCH is the only semi-legitimate airdrop fork of Bitcoin. It provides a counter-correlated hedge against BTC peaking and then declining in price. LTC also provides this, and also offers SegWit for those who still think SegWit is important.
My expectation has been that BTC would moon first, then LTC, and then BCH.
SegWit will die a fiery death. And Bitcoin gold will be insignificant.
Hopefully at the end of all this BTC = TRB (aka Satoshis protocol with no SegWit). A block size increase or not is okay with me, but no increase is better for protecting immutability.