I think what a lot of users are disappointed in is the lack of "bang for the buck" that this new subscription model comes with. Most of the new "features" are really just things that (I would guess) were as easy as turning 0's into 1's in the software. Allowing access to certain features that I would guess were already built-in but not allowed to be accessed. Most of the thousands of library models are supplied by the manufacturers, so I'm not exactly sure why they didn't allow all users access to those in the first place. The ray-tracing is a nice feature for people who actually need it. I think a lot of users like to make those realistic images, but I don't think that was a deal breaker for the majority of HDP users. I'm guessing most of us don't have capable enough computers to fully utilize this feature anyway. I still think they could have kept the perpetual license aspect and just allowed access to these (and other) features as a subscription based add-on to the software. Allow users to "Ala Carte" the software features that they specifically need for their purposes. If they were looking for additional revenue sources, I would think building off of your existing customer base would've been a much safer bet.
Regarding the subscription based license, I'm sure there will be a lot of hobbyist type people who try out the new subscription model for a few months, then just let it lapse. I'm also sure there will be some that pay for the full year at once. Those will be the true test for CA. Year 2 subscription numbers would be interesting to see compared with average yearly update numbers. I only found this software last year, so I'm not planning on switching to a subscription based license. I plan on using my license as long as my computer allows, then I'll be looking for a different software solution. It's easier to walk away when you don't have years of time invested, or thousands of dollars invested. There are still other software solutions that offer perpetual licenses, so I plan on investigating all available options when it's required.
I just hope that this decision won't be the final straw for all of the non-professional/semi-professional users that have been using the software for years. That would truly be a loss. This was a relatively easy software to learn the basics of and be productive quickly. The user forum seems to be pretty active, and most users offer tips and tricks to get you out of a jamb.