These people should watch an 80's regular season game on youtube or NBATV if they want to see what it was really like rather than the nostalgia. Dominique Wilkins would literally walk back up the court on defense if he didn't get the ball on offense when he was calling for it. The Doug Moe/Kiki Vandeweghe/Dan Issel/Alex English Nuggets were one of the best teams in the West in the 80's and literally (using that term correctly) played no defense that I could identify. Bernard King was fun to watch, but he also played no defense at all.
Also, while I couldn't see it then, rewatching some of these games, I can tell that a lot of the players in the early and mid 80's were high on the court.
I will disagree with you on one thing. A lot of the stars from the 80's like Wilkins, Bird, Worthy, Erving, McHale, Vandeweghe, Olajuwon, Robinson, Moncrief, and others would still be great players today. Magic was so unique that I am sure he would still be a great player today, but I am not sure he would be as dominant. The problem with the NBA back then was the depth, especially with the late 80's expansion of the NBA. The talent pool was not expanding fast enough to catch up with the expansion of the NBA, and I think that is a big reason why Jordan won 6 titles in the 90's.