I'm all for 3G pitches. When I lived in the US, I followed local football there, and they all had artificial pitches. Doesn't really do any harm, providing they are well maintained.
Western Mass Pioneers have a 3G pitch, which in a similar situation to what Mr. Cruiskshank suggests, is used all week, all year round by various youth, reserve and community teams, as well as the first team. It makes a lot of money, can tell you that for nothing. An example schedule from one Saturday shows how it can be used.
Schedule of Events
9:00 AM Western United Pioneers U10 Boys
9:00 AM Western United Pioneers U11 Girls
10:00 AM Gremio Lusitano Over 50
1:00 PM Western United Pioneers U16 Girls
3:00 PM Presentation and Acknowledgements for Turf Installation
3:15 PM Western Mass Pioneers (PDL) vs Mass United FC (NPSL)
5:30 PM Lusitano White v Lusitano Red