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Xen is here to stay with the large industry support it has. KVM is too Linux specific to gain industry traction in my opinion. If it does gain traction, it will only be because of sheer mass.

<opinion>
I think Xen will die for most people. Red Hat and Ubuntu use KVM now .. the rest will follow.
Not being in Linus tree and that weird "kernel in a kernel" design will be the cause of its death.
Switching VMs isn't that hard and new installs will definately use the more powerfull and better maintained solution.
</opinion>

Red Hat have added KVM. This is not the same thing as they will dump Xen.

KVM may be good for doing things like running Windows XP on your workstation, if you are lucky enough to have the required hardware support. Much of the hardware sold event today targeted at office use, lacks VT support.

Xen on the other hand can run paravituralized, with very good performance on common hardware, It also have the ability to do live migrations. This is very useful in high availability environments, where you in combination with a cluster file system like GFS would get something similar to RAID, but for entire systems, not just disks. Or you could move from your VM from one machine to another to allow for hardware maintainance with just a few milliseconds loss of service.

These kind of things is very important in data centers, that typically are the ones who pays for expensive Red Hat or Novell licenses, so I would not expect Xen to go away soon, at least not at Novell or Red Hat.