Could work and has worked but dependant on your contract it can hurt your pilot group. Just look at RAH were you can't change A/C type or Airline Certificates (Republic, Shuttle America, Chautauqua) unless you get a pay raise. Not much good that does a reservist on the CRJ who can hold a line on the EMB's. Or the Republic E-170 CA who moved to ATL for family reasons but has to commute to ORD even though SA has an E-170 base in his backyard.

But it could work with the right contractual wording and the proper variable rates that can adjust themselves over time for an increase in larger a/c flying.