I gave it some thought.
Free dining may have an indirect impact. To the extent free dining means high occupancy B&C may have longer waits. The wait would be from dining people who are looking to pay out of pocket for a table service meal or are willing to pay out of pocket for an ice cream break.
My understanding is B&C now serves frozen burgers. I think it's (a little) overrated. Makes a lot of sense if you're staying in an EPCOT resort. Makes some sense if you're going between EPCOT and DHS and the line is reasonable. Makes sense if you have dinner in one of the restaurants and want to go to B&C for dessert.
DDP guest have dessert included, they'll be having dessert in the restaurant where they dine.
JMO but I don't think I'd make a special trip for the sole purpose of eating at B&C.