Since I already know this feature couldn't be done until PS3/XB2 I'll just lay it out and tell me what you think.
The new Live (either 07 or 08) should have all 30 PA guys for their respective teams. Think about how easy it would be......You invite all the guys out for a week. Sit them down and just have them say the player names. Twice, one for home and one for away. Then you could have the different authentic calls for example.....
New Jerseys PA call for Jason Kidd (says it fast kinda yelling)
Houston- When Hou gains possesion the PA says "Who's ball is it?" And the crowd replies "ROCKETS".
Detroit-They get the ball PA'DEEETROIT BASKETBALL"
And my personal favorite the Pacers.
-When Miller nails a three PA "IT'S MIIIIILLLLLEEERRR TIME"
-And at the 2 min. mark PA "Two Min. TWO-AH"
Of course other folks can chime in with their own since I don't watch all teams on a regular basis. But this would truly complete EA's mission on having authentic arenas. Retired jerseys, division/conference/finals championship banners and the true PA announcers.