I'd give it a couple years. Maybe after GT5, Last Guardian, Uncharted 3, Resistance 3, Killzone 3, ModNation Racers, SOCOM 4, Driver 5, Agent, LA Noire, GTA5, FFvs13, FF14, etc. you could say the PS3 has a better lineup than PS2.
PS2 has a massive, amazing lineup which will be hard to beat.