Good thoughts here. I generally don't even lump Desvignes or Jadot into the category of "Beaujolais" given their vinification difference - Joe D once berated me here for using the term "Burgundian" so I'll avoid it - and if I'm honest, I don't love those wines either, as they seem to take away their exuberance and into something more like a dense, high quality Touraine Gamay. One of the wonders of semi-carbonic vinification is the accelerated aging profile - a decade plus or minus does the trick.
Of course other nice agers are Coudert, Chermette, Jean Paul's crus, Pavillon de Chavannes...anything with balance and acid. I'm never quite sure what to make of Thivin - it always feels a little hard to me, but I wonder if a lot of patience would yield something special.
I would not agree that Lapierre won't age, at least Marcel's...about 15 years ago we drank our way back about 15 years with him at the domain, and it was one of the coolest, most sublime, and interesting wine experiences I've had. Everything stood up, each a completely interesting yet different wine.
BTW, the 16 Lapierre Julienas is fairly glorious, with nary a hint of brett, at least here in Jet City.