It seems to me that the take away for Gen Goldfein's address at Red Flag was that the greatest strength of the F-35 is its connectivity and the onboard fusion/display capabilities of the aircraft which provide its pilots with unprecedented situational awareness and control. Now the million dollar question: how much does stealth add to that equation? If you can get 90% of the F-35's capabilities without stealth, would it make sense to put the F-35's avionics into a non stealth airframe? So probably not a 5th generation fighter but maybe 4.8?