People are suggesting that Nvidia will make such big leaps next gen not because based on knowing anything but by looking at RDNA2. While we still don't know much about PC RDNA2. We know from the confirmed spec's of the next gen consoles (mainly Xbox Series X) that it's a pretty big leap. We know the power supply wattage for the console. We know the rough TFLOP's. We know the consoles RDNA2 clocks are using lowish conservative clocks compared to the future desktop counterpart. We know it's an APU so a dGPU will have more die area to work with and hence more CU's enabled. We even know the die size area, transistor count, ROP's, texture mapping units, shading units, both gpu / memory clocks, bus interface and bandwidth.
Again, this is not everything, but from all this we can infer something. It's actually painting a very scary picture. This might be the first time AMD has been competitive in the high end gpu space in a very long time.
Those absurd rumors of Nvidia? Well, if Nvidia want to keep charging the prices they do ($1000+ gpu's) they're going to have to to make a significant leap. How big? no idea, but it's going to have to be pretty substantial.
The only thing that might screw it is over is as usual, AMD's driver support for PC. Lets hope the money gained from AMD's mobile APU's and desktop CPU's starts pouring into their GPU division so they can hopefully improve their software and drivers.
Did I also mention that we also know consoles are not going to be more than $500 because nobody is going to buy a console which costs more than a PC. So we know AMD is providing an RDNA2 chip this powerful for < $500. Yes, consoles are heavily subsidized but keep in mind that is a complete SoC / system with a whole bunch of other costs. So a PC dGPU with this kind of performance < $250 is very possible. They can't possibly price it at a $1000 because then nobody will buy it and everyone will just buy a console instead.
Targonis, all I'm trying to say is, I think so far we know enough to be excited about the future. Usually when companies say things, it's just a PR or marketing stunt but this time, enough information has been disclosed that I don't think AMD is kidding around this time with their claims. It probably is fairly accurate what they're saying.
Do people still care about 4k and ray tracing? 1440p @ 144+ hz/fps is where it's at fam.