I agree dynamic missions are a must. I still can't figure out why modern games just forget this, which was included in classical titles of the late 80's and 90's (I think Microprose and Sierra games).
For my part, as I can't wait for DMA, I started working on a dynamic mission, except it's SP only. It's not very professional coding wise, I do believe Kutya or Tacrod might be able to pull something much more optimized.
Features so far : player gets promotions, random missions, rating for his performance on the field, an increasing number of units to command and to fight against, increased support according to his rank etc.. I re-used some scripts from my version of DMA's CCE for OFP, mainly insertion/extraction scripts, and supports scripts.
Most spawned units use kronzky's Urban Patrol Script which greatly improves the experience and NIM Dynamic Weather (modified). Worked nice with 1.04, quite unplayable in 1.05 due to increased frame rate drop.
Of course, all of this is very very early alpha ***and work in progress

I think 0.22 right now. So, if you want to test and/or contribute, send a PM.
Malick