MTS still lacks the "selling point". Among all the altcoins, what makes MTS unique? What makes ppl want to use MTS? The dev team may consider the best position on the market for MTS.
Less power/heat than all scrypt coins, more stable (start and let it do it's thing, rarely crashes), nVidia hardware works the same if not faster than AMD (780 Ti is faster than a R9 290x). It's a much better option than anything else out there for mining. It just needs a higher value like before.