I believe Lee mentioned that he was using vintage Rooney knot shaping forms, and I would suspect he is proud of that fact, so I doubt you'll see a knot shape change in the near future. Though maybe that was for his 3 band brushes and not the M&F's.
Really, the whole anti-bulb thing is a bit overblown. A few guys got pissed at Simpson for making so many bulbs, a few more added off hand that they preferred fans, and suddenly fans are the new black. Don't get me wrong, I love the fan shape of my stubby or my UK silvertip knots.... but I also love the bulb of my chubby, my TGN SuperSilvertip, and even my super-bulb'ed 2 band duke.
I don't think 48mm is too low for a 2 band bulb... it all depends on personal preference, and I think a lot of people would prefer 48mm to 54mm for a bulb shaped 2 band. I can't speak for everyone though.
my comments were made purely based on personal experience. Short lofted+ dense+stiff brushes aren't my cup of tea and my face doesn't agree with it.