I'm a Pro subscriber and I applaud them for starting to improve Flickr.
However, $49.99 a year just for the privilege of getting no ads? Compared to the $25 people pay for Pro accounts, that's way overblown.
And yes, compared to cloud storage, given 1 TB of storage, this is rather cheap. However, considering that this storage can only be used for photos and videos and that most of these photos and videos are meant to be public, at least within your circle of friends, which drives more traffic to Flickr, well I consider $50 per year to be way too much.
While I am able to keep my subscription for now, I always thought that Flickr is sustainable because they value their Pro users and this move makes me think they don't.