1 point
Yes it is worth it if you want to upgrade now.
Even if you somehow find an used 6900xt that is cheaper you are giving up better rt performance, new features, longer driver support, warranty so imo i don’t think that is worth over getting a brand new 7800xt at its current price point.
Waiting is also an option. But it is hard to tell with AMD not competing for the high-end market with their 8000 series. Owners of 7900xtx may just opt to wait till 9000 series to upgrade.