Coarse angling is probably the most diverse it has ever been, with the type of fishery and angler the OP alludes to being a part of that diversity.
Within 25 miles of where I live there is just about every style of coarse fishing water:
Gravel pits holding carp to well over 50lb, 12lb+ tench, 20lb bream, 3lb+ roach, 3lb+ rudd, the plethora of gravel pits are also very varied in their stocking densities.
Estate lakes again offering a mixture of stocking levels and fish sizes.
Rivers and a canal, that are on the whole struggling but if you look there are a good number of rich pickings to be found; roach to 3lb14oz, 8lb chub, 5lb perch, double figure bream and barbel.
And of course commercial fisheries, which go from an acre farm pond to reservoirs of nearly 70 acres.
I don't think the number of anglers wanting/demanding a fish a chuck is increasing, I think it's either staying roughly constant or dropping slightly. I think there are new commercial popping up but I don't think that's to accommodate more anglers. More filling a gap, or a perceived gap in the market.