New PS2 games are still being released so i don't think you will find any collector who has a complete collection... Doesn't mean i'm not trying (i have around 800 games, but i know there are collectors with larger collections...)
End of last year there were about 5000 PS2 games released in NTSC-J, about 2800 in PAL and around 2000 in NTSC, so if the Wii library only gets to a size of 3000 games i would say it's much easier than collecting for PS2![]()