what you are discussing can be done voluntarily now, but manual work and overhead required to accomplish your goal will be extremely high, and  everyone involved will have to trust everyone else, as in a mesh:  (n x (n-1)/2) links of trust.  Actually, will even need to multiply that figure by 2 since the lines of trust have to be 2 way.  This is why no one is responding to your suggestion - it will end up being a nightmare to manage manually, and just about as much of a nightmare to design/add/test the code for it to be done automatically by the network.

The way leasing will work in the very near future is that there is MUCH less trust involved, n-1. where just 1 way trust from each leasor to the single leasee.  The leasee will still be responsible for calculating and returning the gains, though this *could* be enforced via code by the network, with a bit of work - certainly nowhere near as much work as would be required network enforcement of your shared idea.

I do get you point on it though, you get the psychological effect, then there are still more forging nodes out there; but unfortunately I dont think we will ever see it implemented in code as what you are describing will require tons and tons of work.