Even Canon is not making new EOS M lenses, or selling many cameras. Why make a adapter for a camera that few enthusiasts will buy.
I doubt this very much. They might make one for the Nikon 1 series.
I have seen plenty of evidence that Canon hasn't given up on the M concept, with rumors of new models and lenses. e.g.
The M speed booster would be very easy to make, basically an extension tube with some glass to get full EF functionality in a mirrorless body - has to be easier and better than the EF to NEX adapter. How many would they have to sell to make it profitable? Not many I think.
I picked up an M not long ago, on the cheap and frankly, I'm quite pleased with it. Also, one look on fleabay will indicate that other vendors have Canon M to Leica M, Nikon, Canon FD, etc adapters.
OK, so they stumbled out of the block - give them some time.