As these chargers filter down to aerodromes I'd imagine an increase in landing fees will be needed to offset the cost.
But how will this charging affect the en-route services such as LARS? The military fields that provide these services would have to pay to keep VHF frequencies (which no doubt they can do without); so this bill would be passed onto the end user? They don't see a great number of GA movements so an increase in landing fees won't make much difference.
I can just imagine receiving an invoice to the tune of "Our records show you were on our frequency for 23 minutes, that'll cost you £230"!.
Or, far more likely, services such as LARS will disappear. Yet another way to reduce safety in GA which will no doubt be overlooked by the money grabbing types who are proposing these charges!