Opinion: Are subscription-based apps the future, or will they implode?

The decision of the popular writing app Ulysses to switch from a one-off purchase to a monthly or annual subscription has attracted a great deal of criticism. Here’s a sprinkling of views from the comments.
Subscribe to a text editor? I’m out.
I bought this on iOS last week. As far as I’m concerned, that was a total waste of money now they’re moving to this subscription model.
This “rent your software” crap needs to stop, and people need to stop defending