Songs in the 50's-early '60's always used to be in that 2-3 minute range to fit standard radio formatting. Then LP's allowed for artists to release longer songs, so eventually radio stations went "well, maybe people do want to hear that new Beatles song that is 5 minutes long, so we should accomodate that", but then LP sales have dropped off the radar in the last 15 years so maybe radio has a bit more sway in how long hit pop songs are going to be again. Or it might just be that artists are getting lazy and it's way easier to write a 3 minute song with no key changes or noticable dynamic shifts, than it is to write a 12 minute opus that explores multiple key changes, rhythms and themes.

Regardless...I'm just saying it's no tthe first time that 2-3 minute songs have been the "norm" in popular music.