Not just Oracle. Novell is actively pursuing Red Hat customers and offering to support their Red Hat installations cheaper than Read Hat does. I know a large international technology company which buys RHEL licenses only for the first year and then switches to Novell for support after that.
Does Novell provide their own updates (RHEL rebuilds) or how does this exactly work ? I doubt Novell can redistribute RHEL binaries in this case.
RHEL and opensuse are different - defferent kernels, different config files and slightly different locations for some config files.
It's not like one is a drop in replacement for the other, so it doesn't make sense to me that a business would buy RHEL support and then switch to opensuse.