I agree, Survival mode is for whales. However, I will probably play it a bit. I do have some extra CL cards and those will be out of modern soon anyway. If I don't end up moving to wild, I might as well also play with CL cards in there. Even if I go to wild, I can still play it sometimes.
I do hope they don't allow bots in there. I also hope there's a way to not mess up rented cards. It wouldn't be fun to rent a card to someone else and get it back in a big cooldown.
I am hearing more people considering it as well so may be a good thing for the CL market...
It might be, but it won't save CL. It might go from selling at burn value to somewhere between that and double the price.