I think it would have much greater repercussions over time, eliminating one of the few concrete advantages of Apple products. But for now let's assume it only lost them a tiny share, perhaps one percent. Even that is a massive fortune compared to the money Apple could possibly make selling a bit of marketing data under the table.
I’d be pissed for an hour but at the end of the day my phone, laptop, watch, TV and car all syncing my music and crap with no effort is too appealing to scoff at.
Hell if I found out they had a meat locker of dead kittens hidden in the basement of 1 Infinite Loop Id probably stay loyal.