I hate to admit it, but I've definitely lost a lot of passion for the line. Some if it has been due to limited product releases (as a result of the loss of TRU and fewer waves per year). I was pleasantly surprised to see a new GI Joe wave, and may even have to track down that set.
The thing that set Minimates apart from other products for me was the ability to produce newer costumes for established characters quicker than most other toy lines, while also showcasing the lesser known characters that may have never seen a toy release before. We've seen less of that lately, but that may be the best way to bring the line to the forefront. For example, Spider-Man has a new suit that has zero product as of right now. The X-Men are seeing a push with recent story lines, resulting in new suits and alliances. I think DST has a good relationship with Marvel, but seeing their big events and future plans would help them plan waves that are more topical - allowing them to reach a larger audience or be the first company to feature something "new". I also wouldn't mind seeing a partnership with Kre-O or another block company - possibly providing the featured figure and creating C3 like playsets that would engage an entirely different market that hasn't seen Minimates before. Unfortunately, I don't think there is a quick fix, but the more eyes they can get on the product, the better.