A Model for "Settled" Matches

Our community based mentoring program has been in existance for 28 years. We traditionally have a 33% turnover rate every year which means that we have a number of long-term matches in our program. We have just had to cut our staffing in half, which means that the remaining staff is left with a very large caseload of matches to supervise.

I am looking at creative models for supervising the "settled" relationships connected with our program.

1. How often does a pair need to be contacted after year one? Year 3? Year 5?
2. What is the minimum amount of contact that would be ethical and/or safe?
3. If I maintain long term matches on my caseload, it limits the number of new matches I can make. Is it more ethical to officially close long term matches (what defines long-term?) so that new kids have the potential of getting a mentor or should existing matches be maintained instead?
4. Does anyone have volunteers supervising mentors?
5. How about a cohort of long-term mentors supervising each other via email?

I'd love to chat with other programs grappling with this issue. We can't be the only program which is having to reduce capacity in this economic climate.