Nah. Can't see that being the case. It will likely offer much better RT and a good 10% better performance at least. Not to mention be more efficient running with much less power and heat. Oh and at least 6gb more ram.The 4070 will have the same fps as a 3080 within 5% anyway I'd guess you can probably skip a generation. I'm trying to get an Asus TUF 3080 for the quiet cooling but that would just be a nice bonus, down to stock alerts and luck.
So yeah, if I can sell this GPU for the price I got it for towards the end of the year, then I will have upgraded and got some money back.