Will it become obsolete? Sony?!?!? Blasphemous!
I have friends who are still jumping(and getting GREAT video) from the old PC-1, 7, and 10's. The main difference is the resolutiuon. Yeah a PC-100 or 110 has higher resolution, but the difference is not readily noticed on your standard TV(they can only handle so many lines of resolution). You can see a small difference in the color saturation.
One thing that I don't like about the 5 (and 9) is that touch screen thingy. Besides that, for what most "camera" guys use their camera for, the 5 should work out fine for you. I have a PC-100 and only use a quarter of it's features, so it was "kinda" a waste of money.......
"You did what to whose dog?!?!?!"