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Same here. The old ppc Mac Minis are dirt cheap, and make great servers, taking up virtually no space at all. Debian works great on these, and certainly isn't about to drop ppc support.
Even when Debian "Officially" dropped support for M68k platforms, there is still a port of Etch for it, with some talks of updating it to Lenny..
I wouldn't worry too much about it not supporting PPC at least for another few releases.
I'm a HUGE debian fan. Not so much for Ubuntu and Fedora, and esepecially openSuSE/SLES.