Forgetting the cost for a moment, how would Lightroom service even work? Half the time I use it, I am on my laptop away from the grid. Are we going to have to load our photos upstream to the cloud in order to work on them? That doesn't seem practical to me when you are dealing with a couple hundred images in LR.
I don't believe they're talking about cloud-based apps. I think you download and install normally, but activation and ongoing use requires an active subscription. So if you decide to stop paying, you can no longer open your files in the app. That's my big concern with this model. I also use a lot of site-licensed software at work and it can be a problem running such software when you're away from an Internet connection when the software decides to "phone home", depending on implementation. That could be an issue for people like you taking LR to remote locations on a laptop.
Lots of questions, though, particularly because they're planning to charge $10/mo for a single app and $50/mo for the full boat ($30/mo for the first year for upgraders). That's like buying a new copy of LR every 1-1.5 years, which I don't always do, and $360-600/yr is a LOT more than I pay now for all my Adobe software (PSE, Dreamweaver, etc).
Guess I'll be milking LR 4/PSE 10 for a long while, and hoping they still provide free Adobe Raw and/or DNG converters if I ever need a new camera.
Brave new world.