As for now, according to coinmarketcap, bitcoin's dominance has fallen as low as %43.8.
Bitcoin is already bleeding since late February.
-snippity snip snip-
Eth alone sucked most blood from bitcoin. (Eth dominance is %24 at the moment) Even if we add eth back to bitcoin, it will be around %68. Still nowhere near to %86.
Bitcoin lost so much in a such short time because of a stupid fight over scaling.
On the other hand, if the problems get solved (via segwit) before it is too late and if btc gains its dominance back, we'll be very close to 10k$ instantly.
Ethereum will be the biggest "Bubble" we have ever seen in Crypto currencies. A centrally controlled currency have much bigger risks for the
owners of that currency and to top that, ETH have no coin cap. Bitcoin's value are based on rarity and supply and demand. When you have a
unlimited supply of a currency, it has no real value. I can create a game, where I sell in-game tokens to play the game... these token are not
capped, so I can create as much as I want to.... [ insert --> toilet paper Fiat currencies here ]
Bitcoin can be worth $ 1 000 000 per Bitcoin, because there are a capped supply.
ETH doesn't really have an "unlimited supply" though. It has a supply which increases by 18 million Ether each year, beginning with the 60 million from the crowdsale.
This means that the relative inflation rate decreases each year.
Also, due to lost coins the increase in supply would eventually match the amount of lost coins, making the inflation rate approximately zero.
The
real threat is ETH devs toying with the supply later, since they fork 24/7. Centralised development is the problem, not any current systems which are intended for ETH.