Again with D3's "infinites"I've seen tournaments with grab limits (usually 5) or a rule that states that ddd needs to dash between grabs (or even just no DDD infinites- really everyone knows what that means if they aren't trying to twist it). They do just fine on attendance. I believe Hobo usto do something along these lines actually before it was unity. Genesis 1 was going to ban DDDs infinites until the very morning of the tourney too- clearly did not stop ppl from attending.
Grab limits are nothing new, if the argument is implementation or attendence I would say historically they have shown to have no significant negative effects. DDDs aren't going to stop going, skilled DDDs will still be winning against almost all the infinite (or near infinite) prone characters anyways. An argument against a ban needs to be more about gameplay mechanics, etc... the implementation argument just can't really stand anymore given historical evidence showing time and again it turns out fine.
On flat ground (so no slopes), he can only infinite DK, Bowser, and another D3.
It's not worth implementing a rule that won't have much of an effect overall, a DK main should have a secondary for match-ups like Falco and Wario if he wants to do well anyway...no reason not to expect them to play a different character against D3 also.
Bowser's not important (sorry Bowser mains ) and D3 doesn't hurt his own viability.