To a certain extent, this has been true for more than two decades. I used to work as a radar engineer for the RAAF, and every time we went on exercises against US forces (both teams flying F 18s, but with different missile payloads, we had AIM9s, the Americans had AMRAAM), we would see our aircraft swatted from the sky before we could even get the bogeys on weapons-system radar. Talk about dog-fighting maneuverability and visibility is just ridiculous - if you're using those characteristics, you've already lost the battle. In the control room we used to joke that the USN could have sent P51s equipped with AMRAAMs and AWACS support and they would still win.
Modern fighter aircraft need to:
a) not be seen b) be fast (time to target is still important!) c) carry a decent payload of weapons.
Ideally target selection should be provided by AWACS, and missile-sensors provide the final kill guidance, allowing the fighter (AKA missile-launch platform) to remain stealthy. In the absence of AWACS, the fighter will need to carry it's own sensor suite.
Modern air warfare is all about sensors, ECM and stealth. The airframe is almost inconsequential.
