The short version is that chasing your competition is a certain way to go out of business.
To see why, early adopters have bought your competition's product and your competition has amortised some of the development. If you come along they could cut the price by (perhaps) 20% leaving you with few sales and lots of development cost. On this basis, what is in it for Canon?
Canon did try to leverage their existing user's lens base but the EOS-M was too late to market. Let's face it, three years ago it would have been a weak, me-too, flop. Bottom line - Canon had better not play in the CSC arena unless it has something spectacular to offer.
Sadly, the terrible tsunami that destroyed so much - now two years ago - also seemed to carry off Canon's mojo. If they don't find it soon, they could easily be down at third or fourth place in a year or two. (I'm thinking Nikon first, Sony or Fuji in second place.
Oh yes - MFT is already dead. The X and NEX cameras killed it. Zeiss evidently suspects this too.