There is no OD racing on the bay for the 115. I raced on one all last year, not enough boats. Those that have them, don't race too often.
The 367 is a dieing class for OD racing. This past year was evidence of that. OD racing on the Ches bay is growing thin, and its certainly the case for large boats.
As C2S pointed out with the ratings of these boats, things depend upon the area. Neither the C&C 115 or B 36.7 class's have been strong here in puget sound, but both get a race or two ea year, as between boats here in the US side and BC side of the salish sea do get together at times.
But I would agree, bigger 1d racing seems to be dying out, probably due to cost more than anything.
For local, if one wants a 1d race, one is better of with a J105 or 109 at times. J30's sometimes get off 1d starts. There is also a level 72 group, which include Express 37's, J35, santana 35's and a few 36.7's squeak in too, as do 115's IIRC.