I was never a fan of the "bad boy" pistons... but they would destroy lebron.
On one hand by today's rules the Pistons would be called for a ton of fouls and Miami would live at the line. On the other hand by the 80s/early 90s rules LeBron, Wade and Floppier wouldn't be constantly rewarded for falling down on purpose then crying. My guess is LeBron and Wade would adjust and play like men instead of babies and still be excellent players...but you can't ignore they do play like babies compared to past generations of stars, both in how often they fall down on purpose and in how often they cry like babies to the officials, especially Wade.