It'll remain usable as long as previous distributions of python are available for download.
PyGame is quite a fun resource for learning programming, there's something there about pressing play and seeing your code changes translated into direct visual feedback which is particularly appealing.
The previous distribution of python will only remain usable as long as it installs and runs on whatever machine you're using.
PyGame might be fun, but I don't really see it as a true beginner's environment. It's a serious library, so it takes a lot of initialization, requires flip() calls, and runs in event-oriented style. It's also not included in the standard library.
In fact, for graphics, anything that doesn't create its own window and give you calls like drawPoly/drawEllipse is probably not simple enough to approach AmigaBASIC or QBASIC.
PyGame is quite a fun resource for learning programming, there's something there about pressing play and seeing your code changes translated into direct visual feedback which is particularly appealing.