If you have another card to fall back on or are okay with getting a cheap one for the next few months I would absolutely sell a 2070, 2080 and especially a 2080Ti right now while prices are still high and putting the money towards an Ampere or RDNA2 card in the Fall.
The 3070 is supposedly going to be within 5-10% of the 2080Ti while having better RT performance.
Thinking of splurging on an LG 48CX in the near future, what are the odds that the 3070 will be able to do most stuff at 4k60, potentially with RT on? I don't fancy pushing my luck with wife approval on almost £2,500 worth of purchases!!
The 3070 is supposedly going to be within 5-10% of the 2080Ti while having better RT performance.