@Mark Hoffman
Excellent review of what's already out there.
This is why I hope WGA makes kits in 1/48th.
1. I think 1/48 is better match for 28mm. Most 28mm figures at this point are as tall as 1/48 figures and stockier.
(1/56 T-34 with tank riders. Compare with actual T-34s below. Also note how the 1/56 tank commander is significantly smaller than the 28mm tank riders).
This excellent article with some great comparison pics sums it up better than I ever could:
http://www.frontline-command.com/blog/the-question-of-scale-for-w-w-ii-28mm-gaming/
There's also this thread on this forum:
https://wargamesatlantic.com/community/xenforum/topic/50655/which-scale-of-model-vehicle-do-you-use-with-your-28mm-figures
And some great comparison pics Sam Bellamy posted here:
https://wargamesatlantic.com/community/xenforum/topic/48739/light-vehicles-possibilities
I truly believe if someone new to the hobby bought WGA's Italian Infantry and a 1/56 tankette - post assembly they would say "What the heck is this garbage. Only half his body would fit inside." Kind of a turn off.
WGA could make 1/48th kits and just label them 28mm scale. It's at least as true as saying 1/56 corresponds with 28mm.
2. As you stated the market is inundated with 1/56 plastic kits, and even more 1/56 resin kits. It's barely worth wading into that market to battle with established kit makers.
The 1/48th gaming models field is wide open.
(Yes there are a limited selection of 1/48th armor models. They are however display models with dozens to hundreds of pieces that generally result in a model too frail for the game's table. Contrast that with a gaming model Rubicon manufactures which has 1/4th the number of parts and results in a robust model.)
Too my knowledge there are ZERO 1/48 plastic gaming models made and only Blitzkrieg and First Corp doing a few 1/48th resin models. (If you know of other sources please tell me ;) )