For chrissakes, THE ROTARY ENGINE WAS NEVER BANNED AT LE MANS!!!!!!!!!!!!
How many times do I have to drag up pictures of Kudzus, Courages, and other WSC cars that used rotaries? I mean, seriously folks. What happened was a change in class format that rendered the Wankel uncompetitive due to restructuring.
And in fact the 787B compared to the other Group C cars of the time (especially the TWR Jaguars and Sauber Mercedes) was dog slow - slower than the Aston Martin AMR1 - and it was fuel efficiency and reliability in a freak year that landed Mazda the win.
Mazda knew that the N/A four row was down on power, and experimented with a turbo rotary GTP/Group C car in IMSA competition. It was fast but fragile, and gained a reputation in IMSA for setting itself on fire. However, the Crawford (yes, the Daytona Prototype chassis constructor Crawford) chassis was excellent and Mazda Motorsport was sure they could get the wrinkles ironed out.
Unfortunately for them, Cat. 1 came down heavy on turbochargers, favoring (as the ACO often does) the French Peugeot team. And so, in desperation to continue their winning ways, Mazda put their name on a TWR Cat 1 chassis with a Judd V10 engine. A 4th place finish was the reward for their trouble.
The Mazdaspeed boys took the next three years off and came back in 1995 with a Kudzu chassis WSC car. They nailed down 7th overall, which was not bad for going from custom 5.2L 4 row rotaries to a 3.0L 4 row version of the venerable 13B.
In 1996 Mazda re-motored again, going to the 20B three row and a different Kudzu chassis, going after the new LMP2 category, which they won although the result was a 25th overall finish amidst the remaining WSC cars, the abundance of GT1's, and the new LMP1's.
1997 the rotary presence was reduced to a privateer LMP1 Kudzu effort, but that team still brought the car home 17th overall.
This has been the pattern since then. Privateer entries, variations on the 13B, and Kudzu chassis. Now, though Mazda has funded an ALMS Courage/Renesis combination which scored an LMP2 class win at Mid-Ohio. The rotary has never left Le Mans. It has been restricted, bumped up in class, and lost support from a financially strapped Mazda racing budget, but certainly was never banned from Le Mans.