What now? Well for desktop usage I don't think it makes sense to wait until the next version of the distribution to install new released versions in the meantime.
If a new skype version is released with some new cool feature, the user will not understand why it has to wait 6 months and be forced to update everything (specially if the new distro version has some radical changes, like KDE 4.0, which are far from stable).
It should be the distro mission to make sure every package in the new distro version is compatible with the previous version, so the user can just take a deb from the next distro version and install it on the LTS version (no big problem if that would force the update of many other packages).
This would have the advantage of gaining a stable user ABI across versions and get ISV interest. This is one of the big advantages of Windows systems against Linux distros.