I would prefer a cheap red dot over an RDS just off the top of my head. Long battery life red dots are cheap these days. Pistol dots are getting cheaper, but still more expensive. The shake awake options would solve part of that. Maybe if they have a way to set a rail over that RDS mount.
I like the modular idea. But, you can get decent pump shotguns pretty cheap at times so I don't know how big the market will be. But if they work well and the modular options are good, it still might sell.
The 5.7 carbine looks interesting even if I can't think I what I would do with it. I would rather get a Jakl first. He mentioned a 10mm pistol. The modular bolt action also looks interesting, but depends on accuracy. I have been eyeing the Howa options on Brownells a while.