Then what did you picture because its certainly not 1080ti owners buying the 2080.
40% is still 40%. I think that's a very tempting prospect for any Vega/1080 owner.
As for the price a £130 premium is not ideal but it's worth it paying, otherwise you find yourself in a "cut your nose off to spite your face" situation.
I do think you are underestimating the potential of DLSS. As TinyTomLogan of OC3D said, it could be a game changer. And atleasat 20 triple A games are getting it by the end of the year.
I agree with Tom, but "could be" is the operative phrase there! The obvious point is that none of these features are available yet, reviewers can't even test them! How long till they're in games? Weeks? Very unlikely. Months... at least that. How many games? The ones that YOU want to play? Who knows? So what's the GPU doing in your system until then? A 2080 is doing a virtually identical job to a 1080Ti... only for more money. A 2080Ti is fast as hell, but at anything less than 4K it's 100% overkill with no ability to utilise what it was primarily designed to do with its RTX features.
Obviously this is going to be situation dependent and if the individual absolutely NEEDS a new GPU in their system today, and what their budget is. Many people are going to find themselves better off just waiting, unless that desperate need is there.
You don't know for sure x20 AAA games will get RTX features within a few months and how effective their application of it will be. Heck, we don't know ANYTHING other than what Jensen has told us! It's a big black hole of information regards what RTX will actually bring to the table, other than the pretty visuals we've seen... but at what cost to FPS they may have is another question. DLSS sounds great, but again, more questions than answers at present.