this post contradicts itself, in one breath you blame the damage to the infrastucture on the explosion of private boats, but then go on to say they are rarely used.
If a boat is on a private mooring and is not used, then it doesnt impact the public moorings available, the real story is that more and more public moorings have been lost through disrepair and high rents demanded by land owners.
certainly some moorings that were made available by reciprocal agreements between hire yards have been lost, but then if a hire yard closes, then the number of hire boats reduces, if every hire yard has enough spaces for all of their boats, when some are out on hire, there must be spaces available, and the same for all the other yards, so really the only factor is the number of public moorings available.