The 3070 needs to be practically on par with the 2080Ti, if the 3080 = a 2080Ti then this is going to be yet another disappointing generation. Which would be a big mistake with new consoles around the corner.
I think thats just not going to happen.
A 3070 will probably be as powerful as a 2080S or a little more.
3080 will probably be a bit better than a 2080ti.
3080ti will probably be a lot better than a 2080ti.
Thats me being optimistic.
I hope they increase the VRAM this generation as I'm genuinely scared with the new consoles that the higher end cards might become VRAM gimped in more complex games as texture sizes are bound to increase. Releasing another set of 8GB VRAM cards at the 2080 price is going to be a bit of a joke.
I don't think you're wrong at all though. If Nvidia were to go all out and release 2080ti performance at the price of a 3070, they will set themselves up for dominance in the GPU market for the next 2 years and they will probably long term co-erce a lot of people who wouldn't consider Nvidia GPU PC gaming into PC gaming due to their marketting stategy with LG OLEDs & Gsync. AMD users will probably switch too as its just too much of a good deal to not take up and now Nvidia are semi-open to fresync compatible displays, its one less pro in AMDs locker.
It would be almost a no brainer for LG OLED buyers to grab a 3070 and enjoy top of the line gaming with Gsync and all of Nvidia's recent software optimisations (Sharpening, reshade, DLSS, integer scaling).
The reasoning for my pessimism is Nvidia illustrated last generation that without AMD giving them a tiny kick up the backside, they're content with marginal upgrades and AMD are once again no where to be seen and will arrive with performance to compete at around 90% of the price tag about 6-12 months late as usual.
I do hope Nvidia see the bigger picture and price and release realistically.
The day Nvidia will get a kick up the ass is the day the Xbox one decided to just run windows and allows users to use steam for their games. Then we'll run into squeaky bum time for Nvidia.