Remember when market cap was 120-130 billion?
ETH was around 200$?
Then what ? ICO ! Tokens on ETH and it jumped to 300$, even 400$+.
A lot of ICO proved to be fake, just a whitepaper and asking for big money.
Then ETH went back to 200$-300$.
You will say..."Well, it was 200$, now it's 300$.So it's not nothing, it's +50%!" WRONG!!
It has the same cut of the market, only the market got bigger. Market cap is now 200 billion!!!!
So it went back where it belongs.
BTC will do the same. Instead of ETH's ICO, BTC has the hard forks. This forks bring money to BTC from people wanting the forked coins. But forks will pass. And also the forked coins are bad. Bitcoin Gold is just another ZEC given to BTC owners. Actually worse than ZEC, ZEC has only 2.5 mil coins, Bitcoin Gold has 16 mil. More coins= less value per coin.
Bitcoin Gold = better distribution by equihash mining? What distribution? 16 out of 21 mil are already distributed from the start.
Just like with the fake ICO's on ETH... so....it will come back to it's value, around 5000$+ taking in account the market cap growth.
It definitely will go down it went up too fast in a short amount of time however i think altcoins will start to see all time high's when that happens. Best bet is to stack up on those alts.