Dont forget when etherium fork happens end of this month the reward goes down from 3 eth to 2 eth so even if these card get to 110 m/hs you will still be loosing a lot of $$$$
The market and nicehash tends to flatten out the usd earnings for most coins to be close to the same. Yes you will get less eth unit earnings but usd earnings should be flatten out with the rest of the coins.
One can always mine etc and sell for eth. If there are any big differences. Hence market will always level things out.