Yeah, who thinks it'll only match 2080ti performance? The one that people are saying will be ~2080ti performance was their 2nd and 3rd tier cards, not the top tier. Most people are assuming 3080 +/- a couple of % depending on the game. Nobody knows for sure, but you keep saying 3070 performance, but all indications point to 3080 or higher. I find it hard to beleive their 80CU RDNA 2 chip would barely outrun a Vega VII....Yeah, no. If AMD can only attain 2080Ti/3070 performance with their best offering, then I doubt a mid-cycle refresh is going to come near the performance of an nVidia mid-cycle refresh, let alone surpass it.
I'm going to guess that AMD would be better off hoping that RX 6000 is a huge success, then dump as much of that profit money into R&D for the next generation (RX 7000?) so that it can be a true competitor to whatever nVidia's flagship at the time is.