Good thing that I went back to LP9 not so long ago, for reasons I won’t go into here, so if the new version goes subscription-only it won’t affect me. I would not go into subscription for a DAW as I now use it very part-time. Using it professionally and making money out of it? Sure, no problems if the price is fair. Same as my TV sub, if for any reason I would watch TV 2 hours/month, I would stop paying.
David makes good points about not comparing the tablet market with the Mac market. Someone who decides to not continue using Logic has zero incentive to stay on Mac. Most other DAWs in the market are Windows-compatible so when the time comes to renew your computer you could look elsewhere. If LP11 comes and sells for 200$, with all the new customers they now have because of the price structure they used with LP10, they would make a lot of money. Not so long ago, my day job was selling audio interfaces and speakers, etc. I’ve done that for years and believe me, a lot more people use Logic compared to 15 years ago!!
Apple could decide to charge like 50$ for version like LP11.1, 11.2, etc and it would provide a constant income from Logic. I can’t think of someone who would complain to pay 50$ if the new version has new features the user is interested in. That would make a kind of subscription model but the user can continue to use the previous version if he/she doesn’t want to pay for the new version… as long as the older version you use stays compatible with macOS!!