I have to confess that I'm a little worried about that eventuality as well - that at some point it simply won't run anymore. That's why I've been learning Blender (I seem to be one of the few people who really liked the interface once I understood the basic logic of it) even though there are still tons of things that are just more fun to do in Carrara. :)

On the positive side, even though official Carrara development appears to be at a standstill, there does seem to be a mini-renaissance in community plugin development lately with free plugins for triplanar shader projection, genuine distance-squared falloff for spot and point lights, and conversion of Carrara dynamic hair to exportable polygon-based hair all being released in the last couple months.