Do you want Exchange(fries) with that?

ok so im 100% virtualized now and i have a load of licenses because i have a S.A. Microsoft but something is not right...
why do we need windows server 2008 r2 if you only have Exchange?
If you activate fault tolarance(VMWARE) there goes 2 licenses one for windows one for exchange...
why do we need windows server 2008 if the only thing running is SQL???
we can virtualize 100 servers in to one we can send a man to the moon and send probes to map the microphages... but we cant decuple the OS from the things we want?
imagine this you have exchange running and the os fails your in a waste gate of a nuclear reactor(f"#"##")
imagine that if you could virtualize only exchange and not the OS... that is the future without a doubt...
just my 2 cents?