I think the change sounds pretty good. Will have to see how it turns out, though.

I tried playing survival, but more or less stopped because of the cards being banned in other modes. I did have quite a few spare copies of cards, but in the beginning it was very tedious to decide which cards are playable in survival an which ones are not.
I got tired of going through my collection and "protecting" my high level cards from being used in survival so i stopped playing it completely.
With this new change I might give it a try again.