Anyway Rollbit is open for suggestions thus if the gambler raise this feedback to them they will certainly do something to improve it in the future.
Only if a handful amount of people actually complaint about this but for some reason this is probably the first time that someone actually complain about the layout / colour scheme of the site. It doesnt and wont really affect anything while you gamble on the site so I kinda doubt that Rollbit will do something about it even if he raises his concern onto them
See they have made the whole decision after whole lot of discussion with the developer and UI/UX designer but if there are lot of talks and discussion about it or negative image is being displayed due to some reasons they might change it but it's not a easy task as well as you need to settle each aspect on the same ratio with new color scheme and lot of work but they will do if the community demands so on mass base as you said.