Rtx5090: actually a titan.
Rtx5080: gap is similar to gtx670 vs gtx titan so this is actually a 5070.
Rtx5070: has very close memory characteristics to 5080. So its not gtx660ti. Its just a cropped 5070 (due to production fault) so its cheaper.
Rtx5060 ti: with more memory but slower memory than 5070, it looks like a gtx 660 ti 3GB version. Its truly a 60ti segment. If price is right, could be the sweet spot for the most popular resolution that is 1080p.
Rtx5060: half the memory, low bandwidth, the low end that is still way better in low settings, I think people will not buy this much. Except when they have no space in pc for a bulky heatspreader.
I don't think its fair to call the 5080 a 5070. Now I will totally agree we have never seen such a huge gap between the flagship and the 80 card before, but my reasoning is this:
Prior generations, the flagship GeForce cards would be on the biggest die. Flagships being things like the 980 Ti, 1080 Ti, 2080 Ti. Add Titans to the mix such as your Titan Xp's and Titan RTX. With the exception of the 3080 (which was primarily due to using Samsung 8nm I'd wager), and the Kepler 2.0 with the 780, the base 80 non-Ti branded cards have been the step down silicon since the GTX 680. For example, if the 1080 Ti is using GP102, the GTX 1080 uses GP104, etc. In that respect, the 4080 and the 5080 are absolutely no different. AD103 and the upcoming GB203 is still the step down die from the flagship die, AD102 and GB202 respectively.
From there, what has absolutely changed, is the 70 branded tier cards. Going all the way back to GeForce 200-series in 2008, the cards branded as the x70 (or x75 in that case) was a cutdown of the same die used in the 80-card. The GTX 580 used GF110...so did the GTX 570. The GTX 980 and GTX 970...both GM204. Then Turing happened and suddenly you had the flagship 2080 Ti on TU102, the RTX 2080 on TU104...ok this looks familiar. But then RTX 2070? TU106. And to add insult to injury, a price hike! They fixed that with the 2070 Super going to a cutdown TU104 and seems like how its been before right? But then you get Ampere. 90 returns as a product model and effectively replaces both the 80-Ti and Titan tier cards in branding. Sure a 3080 Ti exists, but nobody would call that the flagship of the 30-series. 30-series is just kind of an odd man out having so many product models based on GA102. The 3080 surprisingly enough uses the same die as the 3090, but cutdown. But the 3070? Now that's on GA104...again a different die than the 80 card on GA102.
Fast forward to Lovelace and we see an almost Turing like repeat of silicon tiering and branding with another price hike but it gets a little more ridiculous. Flagship is the 4090 on AD102. 4080 is the step down die, weirdly named AD103 instead of AD104 like previous precedent...strange, but still in line. OK. Then you get 4070 and 4070 Ti, both AD104. What's weird here is the launch of a 4070 Ti at all that Nvidia was first going to try to get away with calling a 4080 as well. But here's where it gets crazy...In the past a 70 Ti has usually been a refresh card or something released later in the generation after AMD releases something. Not this time. The 4070 Ti now takes the place of what really should be the 4070, while the 4070 takes the place of what really should be the 4060 Ti. And they both get a price hike to boot.
So now with the 50-series you are basically getting a repeat, minus the rumor the 5070 Ti will be a cutdown of the 5080 die, so in a sense going back to the previous silicon tiering that existed since the 200-series where 80 and 70 share the same die, but otherwise you likely retain the same price hikes and its worth noting the difference between the flagship and the 80 is bigger than its ever been. But otherwise it's the same branding shenanigans as the 40-series.
In my mind what has happened is this:
xx90 has replaced both Titan and what used to be previously branded xx80 Ti cards that were the flagships of their respective generations.
xx80 with the exception of the 780 and 3080, remains similar to how its been since the 600-series...the step down from the flagship.
xx70 Ti now occupies the space that really would have just been a base 70-non Ti branded card in the past.
xx70 now occupies the space that should really be the xx60 Ti tier.
xx60 Ti now occupies what should have just been the xx60 non-Ti tier.
xx60 is now what was the xx50 Ti or xx50 tier.
So 70 and below branded cards functionally fell in tier of silicon while at the same time getting a price hike. Flagship tier and 80 functionally sit at the same tiering they always have since 600-series, but massively price hiked as well.