Yeah, by today's NBA rules, most of the greats in the 80s certainly, and even the 90's would foul out a lot too.
The 90's was more violent and physical than the 80's. I think 80's players would have an easier time adjusting to today's game.
They'd have some guys get kicked out and suspended (McHale may have gotten arrested lol) as they adjusted to the rules...but there were some guys in the 90's that wouldn't even be in the league today.