I like the idea of LC+ modern diesels, but with one caveat that invalidates my answer compared to your idea.
I only run traditional size equipment, so though the loco's you mention run on either 036 or 031, they would dwarf the rest of my equipment.
So, I'd like to see LC+ modern diesels in traditional size, possibly the Lionmaster treatment as far as scaling, but probably not quite as detailed as the Lionmaster with Legacy locomotives in order to keep the price down. These would need new tooling. I'd like to see a SD70ACe and an ES44AC.