One big box with everything.
I'd be interested in a good storage solution, if standardising and mass production gave economies of scale compared with the third-party ones, but I gather Rio Grande has consistently expressed disinterest.
Buying the storage solution along with another copy of all the cards sounds a lot less like fun.
As a further complication, complete Dominion is now so heavy that it's into the area of special handling procedures, at least under UK employment law, so it couldn't be warehoused and fulfilled in the usual way!
Improved art (bleeding edge instead of borders?)
Definitely not. Glimpsing cards would become too easy. Playing cards have a border for a reason!
and production quality
You can't produce the cards themselves differently. If you do, people won't be able to incorporate future expansions.
A comprehensive rulebook.
That one is potentially interesting. But it's tricky to see how Rio Grande as a manufacturer could build value around it when the expectation is that you can read the rulebooks by downloading them for free from their website and/or look at the Dominion Strategy wiki, Nick Knutsen's complete rules, etc.
Maybe oversized landscape cards.
No. They wouldn't fit in the randomiser deck, and one complaint I never see is that Dominion doesn't take up enough table space.