Well, allow me to point out that simply trademarking a name is, in no way, a significant indication as to the future of Microsoft's pricing strategy.
Windows 365 could simply be trademarked because they want to reserve the title for something different - maybe they're planning on making a back up service, similar to SkyDrive (but infinitely better), which as the name implies would be run 24/7, 365 days a year.
It would be really dumb to be pushing the fact that Windows 10 is a free upgrade, only to announce at a later date it will then be a monthly fee to keep it (or any future version of Windows) running.
Also, MOST companies that do a subscription based model also offer perpetual licenses. The best example of this is professional-level video editing software, such as Avid. Avid offers two ways to buy Media Composer 8; you can buy a perpetual license for $999, or pay $49.99/month and get the same access, plus the added benefits of guaranteed updates without the extra cost, for as long as you keep the subscription.
As a result of Avid's subscription model, users end up saving money in the long run because upgrades are essentially free, and you're only charged $49.99/month. Of course not everyone can afford that, and some people don't mind missing out on the guaranteed updates.
Adobe has shot themselves in the foot by only doing the subscription model; that's why I went with CyberLink Director Suite, but that's a different subject for a different thread.
So, I guess what I'm trying to say is, let's not jump to conclusions, as I highly doubt Microsoft would make a move that bad. You can almost bet that if they did, Apple's prices would drop rather significantly and suddenly would be the preferred PC by consumers, because I guarantee you most people won't want to mess with Linux.
Let's also assume that if Microsoft would be that boneheaded, they'll at least offer the two pricing strategies; perpetual licenses, as well as subscription based pricing. Honestly, would it be that bad if they offered it that way? I wouldn't subscribe but if it saved me money additionally and guaranteed updates to versions 11 and 12 would be no extra cost? Might be worth it for some people!
"If you want to make an apple pie from scratch, you must first create the universe." - Carl Sagan