Five serious suggestions for making Flickr even greater

1. Guest passes for collections. Make it easy for members to share all their family photos or sports team photos or school photos while eliminating the need to send out a new link and maintaining the ability to manage sets within a collection. 
2. Memorial accounts. Let folks designate their accounts as "memorial eligible." If an account lapses and is unused for an extended period, convert the account to memorial status-- all images are available at full size. But no new uploads are allowed, no more comments can be made.
3. Holding cell for deletions. Whether it's a photo or an account, whenever an item is deleted, just hide it for a week in case the item was deleted by accident, maliciously or due to an error by Flickr.
4. Unlimited number of uploads for free accounts-- eliminate the 200 photo limit. Would make it a lot easier to get my family to join, and Flickr die-hard appreciate the extra features of Flickr Pro (higher resolution, no bandwidth cap, no ads, more videos, fewer restrictions). Sure, some folks would downgrade, but I think Flickr would compensate for the downgrading Pro members will a much more engaged set of free users more likely to upgrade. And more members overall, making for a better community.
5. A dozen free donuts for every Flickr Pro member every year. Because it's the right thing to do. Plus, you could imagine the media attention that would attract? By year 2, donut shops and doughnut shoppes would be begging to join.