It’s clear that coherent shared RAM has no chance of working in such a setting, but how plausible would it be to do some sort of explicitly networked grid inter

It’s clear that coherent shared RAM has no chance of working in such a setting, but how plausible would it be to do some sort of explicitly networked grid interconnect like on the Epiphany or GreenArrays chips? (My layman’s feeling always was that the GA model of a large network of small and stupid CPUs was underappreciated and hampered by GA’s merciless pricing as a possible FPGA replacement, given how painfully bad the latter are at utilizing the capabilities of modern IC technology—single layer, really?—but I’m not sure how true that is either.)