While I'd never buy it, It would be interesting to see the Titan branding make a return, The xx90 being the Titan for the last 2 gens I thought was pretty lacklustre.
Nvidia used to make Titan cards as a halo product because AMD would usually get close to their 80 cards.
They then added 90 cards to the stack. However AMD did not compete on the 70 series cards so there was no need to release a Titan or even Ti. Go watch the GN upload about the card they have now. It's not a 4090 and it uses a behemoth of a cooler. I'd say that would have been last round Titan but like I said there was no point as the 4090 was miles ahead.
Nvidia haven't released a full fat halo card since Turing. And I can't see them changing that any time soon given their 5090 is going to be 2 grand.