Can JBoss/IONA Displace BEA/IBM in the Enterprise?

Anonymous queries: "It was recently announced that JBoss and IONA have entered into a partnership where IONA (who had their own J2EE certified application server) will now provide enterprise support for JBoss. Will relationships like this one allow open source projects to compete with and displace closed source commercial products. Are large enterprises likely to stop paying huge licensing fee's to BEA & IBM, and start deploying on JBoss with an enterprise support contracts from IONA."