Maybe three years ago there were people interested in killing the hangers where the M3 spawns from to protect the base take or act as a pre-strike prophylactic. Numbers in the arena were a tad bit higher. Today most people are interested in doing only the small part of the active fight they are in, during the fleeting time the fight has participants.
There are a few resource porkers who enjoy hitting a field with a Dora trying to take out as many resources as possible before their demise. In some cases they repeat the effort 1-2 more times. As for anyone to rely on so you can stay in the middle of your fun? Only if your squad has decided to take a field and they know to stop the M3's before they can get started. This is a smaller percentage of the time now days.
If you give up your window of opportunity to fight other fighters over a contested base, often that is it for your evening while all you did was get killed attacking an object alone and unappreciated. More players are willing to drive an M3 today to stick it in your eye, than fight for their base since it's safer and has a broader and more lasting effect than a single fighter has.
Another answer to this that Hitech has immediate control over, lower the percentage of the town needed down before getting a white flag. He already changed the parameters for the HQ in response to a shift in game play due to lower numbers in the MA. AH3 is around the corner and this at the worst, near the end of AH2, would promote small groups spreading out and attacking airfields. Like AH1 and AH2 before the town was changed.