Perhaps. But just look at the Petzval lens that just got funded on kickstarter. They will make it for Nikon and Canon. At least initially. Imagine the extra risk and extra cost of researching, designing, manufacturing, stocking and selling that lens for half a dozen different camera systems.
If you were making a lens, would you prefer to make one or two versions or 6-7 versions?
That's fine, and you'll be able to mount it to a NEX/m43 mirrorless camera with full digital link using an adapter (it already exists). We're close to being able to open this market wide open and be able to mount any lens on any body. That's not good news for Canon/Nikon that often rely on making gear that's good enough that people with an investment in the system won't make the switch.
If you were making a lens, would you prefer to make one or two versions or 6-7 versions?