It sounds that you have an interesting situation there! I see no reason why a member should not be able to propose such an item for discussion (his reasons for doing so are not obvious to me though).
The process of abolishing a PC is an elongated one and quite rare (only 1 in 10 years to 2008 I believe. Smaller Parishes <150 electors have a simpler process.
I would be interested to know the arguments put forward by this particular councillor, if you are able to report them