My S27 is in a similar boat, though maybe just a bit below the hypothetical stated in the OP in terms of his recruitability in both music (which he doesn’t intend to major in) and his sport. He, like @Midwestmomofboys is also leaning much more into the athletic side of things right now as a junior. I think the music is still important to him as he is still doing youth orchestra, chamber music, and lessons on two instruments in addition to his high level school orchestra. He is good enough that he essentially is “coasting” on his music though because he is a great sight reader and has so much experience. His ability to stick with all these things may change as he is experiencing his first real academic challenge with all the AP classes he is taking this year.
This spring and summer when we met with a several D3 coaches (UAA and NCAC), one of the questions that I asked was whether it was possible to do a music ensemble in addition to the sport. All said that they had team members doing such things, though one coach made it clear that they expected first year students to focus on just academics and their sport for at least the first semester until they figured out the whole time management thing. This seemed like a pretty good policy. At some schools, orchestra really seemed laid back and only met for 1 hour a week (though I am guessing that kind of place is not likely to be recruiting a principal cellist?). Anyway I found the conversations about this with the coaches useful, even if ultimately my kid decides it is too much to do both.