Pacer fans aren't going to be happy when the dust settles. The Pistons will be penalized much less than Indiana.
Wallace will get a game. If anyone left the bench and it is on tape they will get a game as well. That's it.
OTOH, Artest will bear the brunt. I'll grant there was mitigating circumstances but the NBA has never been one to acknowledge mitigating circumstances (unless your name is "Jordan" which could be deemed a 'mitigating' circumstance in and of itself). The NBA will use Artest's 'history' as an aggrivating circumstance (keep in mind he was penalized for leaving the bench last year (even if it was a bit ticky tacky)).
He won't be the only one but his will be the worse. 10 games at minimum and I won't at all be surprised to hear the remainder of the season. I could see Jermaine getting 10 games if Artest gets worse than 10 (JO will be less than Ron's). Jackson will get whatever JO gets.
Tinsley, Harrison, Freddy will all get at least one game for going into stands.... and anyone else caught on tape.
If the NBA has the power I wouldn't be surprised if they declared this game a forfeit on both sides and neither side getting a W. Once again, Indiana would get the worse of that punishment (since Detroit already scored the L).
The NBA will come down hard when it is all said and done and Indiana just has more 'punishable' people. I'm not necessarily saying 'guilty' people but I don't know what the NBA could do to make a point of the Detroit fans to balance this out.