The NGAD was just a way to test out concepts. But the idea it would lead to a design mature enough for production was far fetched at best. Just like China developed the FC-31 in several iterations but now has to go for a new prototype for J-XY and who knows when will a final design which can enter production be available. For the concept the US talked about with NGAD to happen several changes would have to happen with the US MIC and I do not see any of them happening.it's kind of unrealistic for people to think that NGAD can achieve IOC by 2029 when it took 14 years for F-22 to go from start of EMD to IOC and 17 years for that to happen with F-35A. Assuming things do move faster with NGAD, I think we will start seeing early production squadron doing testing & evaluation by the end of this decade. I don't think we will see IOC until early to mid 2030s.