This really isn't a sensible point you're making. You're basically saying that a MOBA shooter is better than a TDM game type because games already have TDM. Your logic is literally hipster logic--it must be good because it's not popular!
If people legitimately wanted a MOBA shooter, don't you think that said MOBA shooter would be getting worked on somewhere? Maybe a major minority (which includes you) wants it, but that's not how a company works--you don't aim to provide a service that won't have much of an audience (unless you're a luxury provider who charges $1,000 per product).
But like I said, we're getting a bit of a MOBA thing in Titanfall. We have the mindless drone A.I. that will barely register on your threat meter, but it's there as an attention span checker. That's what the creeps in MOBAs are. That's what the A.I. guys are in Titanfall.
Titanfall literally has that MOBA element in it, just without a static base to defend. Guess what? People are complaining up and down the streets because they think that the inclusion of A.I. combatants is moronic, and I can't exactly blame them and say that their complaints aren't justified.
Hmm, so in your world the same thing over and over again is good. Your world must be really boring.
And Id hardly consider the inclusion of random NPC = MOBA.