Couple of new DMs (for Rollplay) , maybe one or mare can become a (semi) regular DM? Would help to fill in the gaps in the schedule when it's light on (regular) Rollplay content.
If it's doable (not to time demanding in finding cast members and such, and DM collaboration), a west marches style game with a rotating cast and DMs. This would (in theory) solve down time in con season, unless "everyone" is prioritizing cons over roleplaying. To avoid DMs stepping on each others toes, they could each be responsible for an area of the world, or the DM notes has to be kept someplace centralized and each DM has an understanding of the need for all to pull in the same direction.