The MGS is transportable by C-130. The loading and unloading have to be performed carefully, but it can be done. (I know the guys who did the test, and I've seen the photographic record.)

With regard to tires vs. tracks, that debate has been going on for decades. It will continue to rage for decades precisely because there are pros and cons to each solution. The only change I expect we'll ever see is maybe a hundred years from now we'll add counter gravity into the mix.

Finally, a note on tactics. The Stryker Family Of Vehicles (FOV) is not designed or intended to fight as heavy combatants. That's the job of Abrams and Bradley. If you put a heavy weapon (25 mm or .50 cal) on top of it, it can provide a base of fire to support the dismounts as they maneuver against the target. The MGS can provide support by breaching obstacles, as well as performing in the role of a tank destroyer to keep the bad guys armor at bay - which would probably be done as part of mobile defense. Having said the last, it might be useful to look at Rommel's Chergbourg and North African campaigns to see how he used towed anti-tank guns offensively.

I assume "Dingo" refers the vehicle from Krauss-Maffei Wegmann. If so, it isn't the same class of vehicle as the Stryker - it's in the JLTV class. As for Bushmaster, it wasn't considered vs. Stryker because it didn't exist at the time.