I catch some friendly flak from a more traditional ML'er every now and then when I am shooting an Inline.
Last time this happened, I put the Inline away in a case, went to the next case and pulled out a percussion sidelock and asked "can we now be friends"?
Seriously though, there already was an idiot bill introduced here in Michigan to restrict inline ML hunting from the southern shotgun/BP zone to the rifle zone only.
I think as long as ML's effective performance range regardless of design stays where it's at then things legal-wise should remain mostly the same.
If effective ranges and designs venture out beyond 200 yards, then I would expect and largely appreciate some sort of regulation. The trend is more populous areas and longer range weaponry will become a liability in these areas.
My .02 on the off topic.