Oh my, do you want a long wish list...here goes...
Re beer, DH has really gotten into cider, he used to go to beer festivals etc. He's a bit wary of gluten free beers. Plus when he was into beer, he had really high standards so thinks they won't taste as good. But craft/artisan ciders are really taking off now and they are a genuine alternative. So are some of the gluten free ginger beers that are out there.
Generally, I'd like to see more things that are gluten free but not so processed (so the things that are full of soy, pea fibre etc really put me off). So things that are made from e.g. chestnut flour. Things that don't try so hard to mimic gluten products but are a genuine alternative- so a cake made with nut (and not just almond) flour. So instead of trying to use 17 different ingredients with chemical compound names, finding a natural alternative. As well as things that are fresh, not with a shelf life of months stuffed full of preservatives.
I would also like to see more gluten free things that are also mindful of other dietary restrictions- dairy, eggs, soya and especially fodmaps. A lot of the people avoiding gluten are avoiding it because it is a fodmap, so seeing things like inulin and pea fibre used instead is really off-putting. So ther eis abit of an untapped market there.
Things that aren't chocolate flavoured would also be good. Genius do some lemon cupcakes which are nice, and it's good to have a sweet thing that isn't chocolate. Similarly there is a honeyrose gluten free banana cake that's pretty decent. Partly because chocolate is a fodmap, partly because actually, it's pretty easy to get gluten free chocolate, it's already a pretty well served area.
And also things that are also organic/free range and gluten free. I was really into organic foods and food quality before I found out about our intolerances and if anything, the food intolerances have just made me more mindful of the quality and origin of food. Some of the gluten free ranges are pretty lowest common denominator when it comes to ingredients.