That's certainly true (and I think I acknowledge that in my comments). The problem for Canon, Nikon and Olympus is that implementation is something that's relatively cheap to improve, whereas core technology isn't. Samsung have the resources to introduce an NX1 MKII next year with improved handling and ergonomics, and a MKIII the year after, and keep writing off models until they hit a sweet spot or decide to stop losing money. Think about how quickly Fuji has learned from their users and how that's built a reputation for them. Their limitation is technology; AF and video have been their Achilles heels. Samsung have the resources to keep updating the technology as well.
It's fair enough to say that the 7DmkII is mainly an upgrade for Canon users, but if it's not also compelling to outside users, Canon runs the risk of selling to a diminishing dedicated user base. Right now the balance is with Canon, but if the likes of Samsung and Sony continue improving their products, then in only a couple of years, buying a 7DmkII could look like a silly decision.