1.) I think we need to define 'enterprise' here. From some of the editor's statements, I don't think he knows what is required for Linux to succeed here.
Personally I don't consider someone's basement or a University an enterprise. It is tens of thousands of 'enterprise class' servers ; support (meaning drivers, testing, the other vendor will take your call) for all their peripherals like 10G, IB, HCA's, enterprise SSD's; thousands of developers/users ; it requires third party software for other critical enterprise functions like clustering and security. (And then running them and supporting that configuration for _years_.)
If a business doesn't have these requirements could they get away with moving "away from the idea of a 'frozen' kernel'"? Perhaps, but then you have another problem: management. Enterprises are typically large companies and those whose core business is not technology aren't particularly concerned with hiring more Linux implementers than is necessary. We're expensive and can be annoying. They'd prefer the indemnification of purchasing some contract with a company that
says if half your Linux team walks out you will be ok. (Regardless of if that perception is real or false.)
2.) Honest question (not rhetorical): (Excluding embedded.) Without the Linux enterprise's, doesn't this just become a hobby OS?