I would hope that you would consider making premier line G scale stuff. I have a lot of your G scale (70+ cars, and 23? engines) and I like them. I feel some easy upgrades would make them premier level and would be highly desired.
I like your couplers on the gauge 1 cars. It would be great if there was a adapter included that would allow them to be body mounted. Long trains tend to derail easy when backing up with truck mounted couplers. I will upgrade to KDs for body mounting. Your couplers would be fine for me. I may look at making my own adapters to keep using them. I'd buy them if they were available.
That brings my next suggestion. Diecast trucks on rolling stock. Yours roll great and look good. Adding weight to the cars up high doesn't help much. Having heavier trucks would make them much more dependable again, when backing up long trains. I'd pay extra for them. I may try to add some lead if possible down low on the trucks.
I can only hope that a suggested modern diesel comes out. I like the Dash 8s and would like anything modern that would run with them. I believe Mike mentioned an Evo model with flashing lights as a possibility? Slightly thinner wire for handrails and grabs would improve the looks. Better detailed fixed pilots without those huge holes would help too. The snow plow looks toyish with it's huge holes too. I know it's to help with tight radii. Many users leave on the included floating pilots anyways. So a better detailed fixed pilot would help buyers who say the products are too toy like. Aristo (was), USA, and even AML seems to be working on the looks of their modern diesels. Their's use couplers that are body mounted. I wish there were screw holes and mounts for KDs on the diesels too.
So your G scale releases seem geared towards the older era's. The refer cars are an example. There's not many guys who will buy an older ice carrying car that has a modern paint job. I am hoping for a modern version of this and any other rolling stock you would make. I really had no interest in steam era stuff. I caved in when all my guests seem to prefer it. I even ordered the Bigboy. I would always buy modern stuff first. I like to run what I see currently on the rails. Having models that capture that look, would make me very happy!!!
Thank you for considering anything here.