Well, this is just regurgitation think tank points.
This Decade of Concern argument fails to justify itself when you look at actual facts. It is more of a cultural meme caused by Americans perceiving the successes of foreign countries as a result of America being distracted, trickery, cheating, etc... There are two questions that should be asked:
Which side has been introducing new platforms faster? China. In many categories, China managed to develop and field competitive platforms and, in some cases like the 055, it outright surpassed Americans. We saw even new platforms such as J-16 and J-20 getting multiple upgrades and a new J-20 variant is about to emerge. So, unlike what could be argued 5 years ago, the rapid iterative development is not limited to catch-up.
Which side is getting equipment faster? China. Even in the fighter jet department, which is among America's shining successes, PLA is getting aircraft as fast as the US Armed Forces does. All of the USN fleet plans of the last 20 years failed while PLAN added hundreds of thousands of tons every year.
So no, there is no window of danger. It is getting worse for the US every year. You said NGAD. What about 1000+ J-20's that will be available by then? What about the H-20? What about the 095, sino 6th gen, DF-27 and vast investment in air defenses that will happen until then?
You said LRASM successor. Again what about Chinese investment in air defense and PLAN ships that actually have the equivalent of LRASM successor now? I don't know what else shows better than this that Chinese tech introduction is not limited to catch-up.
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Japan and Anglosphere were lost causes but European-Chinese relations could be handled better. I am not sure about India.