I am also pretty sure that ARM does not have the same amount of development money that Intel/AMD does.
Arm is probably the best "second" CPU bet for the future, behind x86.
The problem is that so was PPC back when it was chosen.
I really see the Atom-type CPU's eventually taking over the market that many Arm's currently hold in mobile devices, then you're back to x86 again.
Arm's slower than those aren't really useful to us.