Well, I think there are 2 different markets that Redhat served, at least in this context....
The first would be the Linux "users" who want a widely used, well supported (in terms of updates and patches), and well documented distro to use, one that they would pay for. One that they will have the least amount of "trouble" type issues. To me, these people are mostly non-Windows Windows users if you take my meaning.
Then there are the true tinkerers and hacks that used Redhat just because it was a free download distro that's fairly easy to work with and common, which is the category I think most of us around here fall in to.
It's my belief that members of the first group will wind up on Suse (most likely) or Mandrake (less likely). I'd tend to think the members of the second group would continue on with Fedora or Mandrake, maybe moving on to a more advanced distro like Gentoo or Debian or Slack.