The last time i checked the default campus core technology was
Ethernet.
Anyway, there's a saying at NASA (thanks, Milo 
that given
enough thrust even pigs can fly.
What i said is not that ATM cannot be made to work in some limited
environments, but rather that it is going to the junkyard of
overhyped technologies which tured out to be more expensive and
less reliable than simpler and dumber rivals.
--vadim