When you look through the RM, there is a significant (but not necessarily sizeable, yet!) proportion of add-ons, some paid, that have no developer involvement in discussions or issues/queries/bugs. As we start to see XF release new versions again soon too, some will become incompatible too. I feel this should either be obviously highlighted within the RM and the add-on moved to an 'archived/abandoned/incompatible' category (which doesn't appear within RM search results) until it's issue is addressed by the developer.
As XF growth exponentially increases with new releases, I feel that the lack of attention or policy on this issue will really start to cause problems and reflect poorly on XF as a product, and as a community. The growth will mean that less astute or savvy admins will come aboard too, and install/purchase add-ons without reviewing it's current state and/or developer involvement which will cause later disgruntlement, especially if it was purchased. And that disgruntlement will fall on XF's shoulders for not managing or highlighting such add-ons.