This has been my thinking for a while, I don't think I would make anywhere near enough use of photoshop to make CC cost effective for me. Like others I started with LR4 and have since upgraded to LR6. The problem for adobe is I'm the kind of person that doesn't make them enough profit having paid them around £160-170 in those 5 years. If had been subscription that would be £600 for 5 years. This changes seems to be around making more profit, they are a business after all, and not so much based around the user. I feel they have have done their sums and worked they potentially only need to turn only a small percentage of existing users to CC to break even, even if they lost half of users prior to CC introduction they would still make more profit than from the standalone only era. Since moving to Lightroom I've liked the workflow, much better than I used to have. I like only keeping the raws and Lightroom catalogue, and only exporting when I have a need to.
Sounds like to me if you use both photoshop and Lightroom the subscription is a great deal. If you use only Lightroom like me it's a lot harder to justify. The one thing I don't like about scription based deal is that they are partly tying you in because you lose that ability to edit images once you end the subscription. The other aspect is over time you are going to build up more and more data storage, something they can double your scription with once you hit a certain storage level. What's to say in the future adobe see their profits plateau and they decide to end Lightroom classic and then LR CC is the only option with your subscription cost depending on the size of your image library, and adding photoshop is £x more as an addition.
My question would be if you went LR CC, what would happen to your cloud storage with all of your images stored there if you ended your subscription? I can't see adobe letting you keep cloud storage indefinitely for free.