The recent ECB survey is not reliable, based on only two years, but it suggests club cricket participation is declining. Perhaps leagues and clubs are not providing what players would like. The appetite for days lasting 100 overs has diminished – or has it? There has been no mention of geography or north-south differences.
As a long-term player of 100 'restricted' over games (with draw as a possible result), my reluctant action would be to reduce all divisions below the elite to 40-overs, straight limited overs.