Personally, I believe the prerequisites for a Guardian and DAH mech set have been met.
Functional to lvl 100 (Originally could have been limited yearly upgrades, like Sepulchure and SkullCrusher, but now there's Auto-Scaling available).
Wide variety of specials to work with.
Advanced detail and animation capabilities on the Staff's end.
SC-Only specials to make them stronger for SCs specials-wise while sharing the same SC-grade DPT with NSCs.
The only thing holding both mechs back from being realized is the time needed to properly plan it out, design it, code it, animate it, test it, and balance it. Regardless of their setup, I don't expect both machines to match or exceed the power of an SCM, since after all, they are just usable bonuses that aren't hard to come by (as opposed to an ShS T-Shirt or an MQ Artbook). Just like the Verified weapons and equipment in DF and AQW, these will probably not be anything overly special. At most, I'd expect them to have standard SC level damage (NOT SCM level), while the SC-only Specials make them about on par with an average SCM (basically; the Strider or Reaper). And before anyone chooses to debate this, this is no different from the Verified stuff being average to slightly above average in the other games.
The other "quick" projects that could be possible were the Flag Set (either as some sort of special Shoulder weapons, or the first ever visual equippable Mods), the GEARS Bookstore (shop), and the Sniping Class (which could either function like the 1st Persion Shooters, like what was used on Westion to shoot rocks or ShS aircraft and missiles, or something like Braddock Steele's side-scrolling shooter).