Awwww, this is so sweet! Good on you for trying to make a difference. It matters.

The best thing I think you can do is to educate other people! Spread the knowledge through word of mouth or social media! Doing so will create a chain reaction of knowledge.

I’ve never contacted the manufacturer – as long as there is enough demand for a product, the product will be made. I think the key is to reduce the demand by increasing the demand for alternative products such as dog crates and xpens for house rabbits. For that matter, spreading the word that bunnies are better off inside would be a good start.
I’ve only gotten as far as getting some of our local stores to request signs for the small pet area that say that xl dog crates and dig xpens are also commonly used as rabbit housing. It’s up to their corporate offices to decide if the signs will be allowed. I don’t know what the profit margins are on the bunny cages vs dog crates/xpens, but I’d guess bunny cages have huge margins. I’ve offered to make up bunny info pamphlets that tell what bunnies need (the store would be able to sell more hay, pellets, bedding, etc) but most aren’t interested.

The problem is that there are people who want poop to fall through to a tray below. You might have better luck convincing them to have half mesh and half smooth surface to at least give the bunny a place to get off of the mesh. The problem is also that hutches, cages, and pretty much the vast majority of housing sold “for rabbits” are all too small. Unless there’s a run or play area attached, the cages are mostly too small. Add the mesh bottom and you get a cramped bunny with sore feet.

You’ll never know until you try. Most manufacturer’s customer service folks will pass on suggestions to product development. If you can “sell” a benefit from a business perspective, you’ll have a better chance — how can changing the flooring make them more money? Maybe suggest a solid platform that can be added over part of the mesh flooring as an option to start? They aren’t going to want to redesign and retool (costs money) without determined demand but an add-on gives them something else they can make and sell.

I get worked up like that too. Its so hard watching easily fixable things ho unfixed. But, if no one gets worked up and no one tries, nothing will change.