That doesn't bode well. Isn't a large part of the appeal of a Mac that everything "just works"? How do you suppose sysadmins will now feel if banking infrastructure apps no longer "just work" and will now require an additional JVM to be installed from elsewhere and kept up to date through separate channels from Apple's?
I expect they'll get along just fine, the same way companies rely on, say, VPN software where updates are distributed from the vendor's website rather than the OS vendor's website.
Or they could do their development on Windows or Linux in a VM. Or via VNC or the Windows equivalent.
At the last big Weblogic project I worked on, the (many) developers worked on Windows in VMs, on Windows boxes. One advantage being that we could use VM images pre-configured with Eclipse and whatnot set up just right.