Sorry what? What have you been smoking lol.
Firstly, we don't have any idea how performance will be really, until we see benchmarks. And sure, the raw power might not be a lot more, but it is a drastically new architecture. With things that old cards simply cannot do.
And then the virualink port isn't proprietary at all mate. It is a standard between ALL parties involved even remotely with VR. Please read up on it before spouting nonsense man.
I really think this is a huge step forward, with the AI cores and RT and such.
However I would wait a while before getting them, as right now their usefulness is a lot less than it will be in let's say 6 months time. (when games start really taking advantage of what Turing can do). Unless you really need the performance. I think the RTX2070 is not overpriced at all and should be a really nice value for money card.