Besides all of that, repetitive?
Man, you're talking about the way wrong series. Mega Man games are all about bringing you the good stuff again, with only one or two well-thought out changes in pace (...okay, aside from Rush Cycle and the Ride Chasers).
So I can only guess here that one might think that Capcom is not choosing the right tweaks to make to the series.
And, to an extent, that's true, albeit subjective, so I can really only base this on very recent general sales and feedback the retail part of the industry has generated:
MM9 was by all accounts great, but many people are incompatible with the digital-buying format. A nitpick, really.
MMZ2 was okay, 3 did very well, then 4 was mediocre.
MMZX sells very well by all accounts, whereas ZXA is only liked by a very small niche.
MMEXE 1-3 were good, 4 and 5 are dogs, but 6 is a bit harder to find and had better pacing through gameplay tweaks such as the easily accessible Crosses.
MMSF 1 and 2 were a bit low, and 3 was to an extent, but fans did like the gameplay tweaks.
So with SF3 and MM9 as our latest points of reference compared to ZXA and SF2, I'm very, very optimistic about the next Mega Man game.