KH are linux specialists but that doesn't mean they cant spread their wings to accommodate another VPS market - there aren't that many quality windows vps providers and KH can fill that gap. My 2 cents.
To have the choice would be a nice thing, but I would not want it (choice) at the expense of reduced quality/performance/support on the side that made the company what it is today. This is meant as more of a potential business issue rather than a technical one. KH has shown good business judgement thus far so I'm hopeful that will continue.