I am torn
I really rate Jetbrains (Like Wax Lyrical over their IDE's), but the subscription model for things like Adobe came about because individuals who couldnt afford the £3k for the master suite of products were just pirating it. I'm sure Jetbrains has the same problems but their products aren't expensive, I mean for just over $100 you get IDE's that blow anything else out of the water featurewise (Note: I am aware that an IDE is a highly personal thing... my point isn't to start an elitist war on "My dev environment is better than yours").
I do however understand the pricing model for polyglot teams / developers who maybe dont want to spend around $400 each year to upgrade when they can get the whole lot (and maybe a few other products they just couldnt justify on cost means) for around $20 a month!
My main worry is it would cause apathy within Jetbrains development in creating new features for the IDE's when they know they have guaranteed income from it each month...