On the flip side, I've been involved in a situation the other way around too, 3-4 different bands, all quite good and musically practiced.... wanted to double the amount of services... in hindsight the best way to do it would have been to explain that the quality would drop a wee bit musically. What ended up happening is that the musicicins spent all day on a Sunday playing both services and lots of people just dropped out the rota as it was too much.
Sometimes you cut according to the cloth you have.
Also what you're aiming for depends on where you are at as a church. In some cases a stripped back simple but honest approach of 2-3 musicians doing acoustic type set well would be better and more authentic than trying to recreate a hillsongs conference in the suburbs every Sunday.