It's a really poorly constructed question.
Are the GPC being revoked because eligibility criteria are no longer met or is it some sort of voluntary relinquishment or is it an anticipation of a qualified clerk being replaced by an unqualified one or is it the proportion of co-opted to elected Cllrs falling below the required level?
How inhibiting will it be....? Well, where GPC allows a PC to conduct any general business, as a business might, the absence of it removes that authority and the PC reverts back to only those duties and responsibilities which are bestowed upon it by relevant legislation.
This is a daft question - yes, there really is such a thing as a stupid question. I wouldn't quite go that far in this case but it certainly lacks forethought.
If the difference between having, and not having, GPC is not known to someone then they really must question whiter they are a credible person to be charged with ensuring due process is complied with whether with GPC or otherwise.