More roots is better. I would definitely remove the fruit before you remove the air-layer. They will suck up energy that should go to roots (after removal) just like figlets suck up energy on a cutting when you are trying to root it.
The issue after removal is water, water,water. The new roots need to be able to supply as much water as you are losing through the leaves. If you have too little roots, then you have too little water. This can be remedied by adding roots, subtracting leaves, increasing humidity (greenhouse or substitute), reducing heat (direct sunlight), or any combination of those things. After you cut it off, then it is a lot like a large cutting that has started to root: same issues and same solutions.