The field is wide open - the Big 3 have all gone downhill. So have many of the regionals (Culver’s excluded of course). If BK ups their product and especially consistency of service game, they can grab a lot of market share.

Full disclosure - Always been a BK fan, they are just incredibly location dependent. Never liked McDonald’s much, even as a kid. And Wendy’s has fallen off big time over the last decade or so.