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Yeah this is what I am wrestling with - sensible thing would be to buy 3080 then sell it on at small loss for the ti - but there is a lot faff involved with that and I imagine quite a few will do this upgrading from 1080ti/2080ti where ram is not quite there yet. Or just get the 3090 - probably gonna be 400 quid more than the ti but you can just sit on it after that and not worry.
Not sure how to move from my 2080ti either. As I need to get it on water ideally, I think I'd be tempted to wait for the 3080ti rather than faffing around with the 3080