Yeah no hope, the rx 5700 is cheaper and better than the 3070 on eth in every regard, although x other algos it sucks x 3070, 3070 was a failure from the start. The 3070 is 30% slower than the 3080 and is 30% cheaper the the 3080, you might say is good but it's not. We will see what amd brings to the table today, I think concerning eth mining, none will be better than the old rx 5700, remember that rnda2 is about gaming, not mining, so those 50% will not translate to mining at all unless some algo uses the same instruction set efficiency rnda2 brings.

Right now nothing is better than the 3080 for mining and gaming however power consumption is disgraceful. If amd can use gddrx6 and do wonders like nvidia did to 3080 with half power consumption then they have a winner. I have friends at amd that told me they are working on a blockchain gpu. So today miners will be disappointed and later on if mining still active in 6 months then people might be happy hehe