Flag segments for reasons other than hazards + Trusted User Review
This is a 2-part idea that ideally would be implemented simultaneously:
1) There are many, many segments that are poorly defined, are near-duplicates, are poorly named, have errors in spelling, or are just dumb for lots of various reasons. This has been a problem from the start and is only getting worse as more users join Strava. I would like to see some way (beyond the 'Hide' button) to mark a segment for these reasons and get it reviewed and possibly edited, deleted, or merged with other similar segments. This type of flagging would not be as harsh or black-and-white as the current 'Flag Segment' action; rather, it would put a segment into a queue, to be reviewed by Trusted Users (see next item) who could take action to correct problems.
2) Trusted User Review: if you've ever used the StackOverflow/StackExchange family of websites, this will be familiar. The idea with those sites is that users gain "reputation" (community trust) by performing various tasks, such as posting a question, answering a question, getting up-votes, etc.. As a user's reputation increases, they gain privileges such as being able to edit other people's questions. I'd like to see some similar scheme for Strava but more focused on segment review, editing, etc. Reputation could be established by defining good segments (maybe there's a 3rd item here to have segment ratings?). Reputation could be decreased if a user's segments get hidden by many people or some such. There are lots of possibilities here but the point is to move the workload of "policing" segment creation and maintenance to users.