No it wouldnt.
Let me tell you a story. Before I bought a 360 I had a chat with my wife to see if there were any Xbox games she still had an interest in. Now we have one we will not buy another Xbox game period. Reason is simple dont want an obsolete unit clogging up the place.
However because of the nature of the PS3 we will be buying PS2 games after we get a PS3 as well as PS3 games. God of War II coming top of the list I expect. Therefore the PS3 will transition much easier (which a good thing considering the number of PS/2 games we own between us)
As well as using it to watch blu ray movies