Mining based funding of BCH devs is critical to reduce reliance on funding from Nchain/CSW/Ayre. Nchain/coingeek will fight this proposal tooth and nail.
A dev who's funded is a dev who can be influenced unduly.
I think there is something to say for business model of devs having a stake by investing in BCH and growing value of their investment by improving value of the network.
Definitely something to be said for that, maybe more so for businesses that should be hiring the devs. (Miners mostly, for now.) It's a lot of risk to bank on price rise for income.