Heard that board partner already stop making 970 in preparation of pascal release. So brand new 970 won't be that cheap even with pascal release. And i imagine there will be people try hunting for cheap 970 to sli their current config.
Seems like people have a problem with it after they overclock it using Trixx software. So don't use trixx, overclock it with other software and it should be ok. I would still keep the fury OR seel both fury and 970 and get new pascal gpu when it comes out