She's in no rush, but clearly the software
developers will eventually no
longer support the old OS and then she will have to upgrade. So it's good
to find out what will happen when the time comes. She is a graphic
designer and webmaster so it matters that she be able to run new versions
of Photoshop, Illustrator, GoLive, etc. and at some point OS 9 will be
obsolete.
That may well be Job's dream, but I doubt it. Apple isn't even going to
initially ship machines with OS X installed, so for maybe the next year
there is no real push to write software specficially for it. Look at the
switch from 68k to PPC as an example.