I walked the Canal Path this afternoon, and in about an hour there were over 50 other people there, including children. It actually seemed congested! I can imagine that even 2 or 3 cyclists would have caused significant problems for people.
There would no little possibility of widening the path, because when I spoke to the people surfacing the upper area, and they said they could not make it wider, or put in edges because of the water vole tunnels that run under the path.
Note that despite the walkers only and no cycling signs on the entrances, some cyclists persist in using the path.