Will the 3D Classics have an effect on the Virtual Console?

An example would be the upcoming remake of Super Mario Bros. Will this affect the chances of getting Super Mario Bros. Deluxe? I suppose it's Nintendo's decision, but it may be that SMBDX is inferior enough to the NES version that it wouldn't have an effect on sales.

One thing I'm concerned about is Donkey Kong Country, which was released to both the Game Boy Color and the Game Boy Advance. The former is inferior, but why would Nintendo release two versions of the same game? I think Nintendo would rather release Donkey Kong Land.

One game that we'll never get is Tetris DX, as it's just another Tetris game and would hurt sales of other versions. The Game Boy version would actually sell phenomenally well, as it was a bestseller on the Game Boy and marked the birth of the "Tetris Theme". It's also in black and white, so there's nothing against it.

An example would be the upcoming remake of Super Mario Bros.

What remake? The only thing thats coming is a port of the NES game. But you're right, Nintendo would probably prefer to sell you both Super Mario Bros and the Japanese Super Mario Bros. 2 on the NES than sell you both together as a GBC game. You won't be able to play the new multiplayer mode anyway with the GBC version.

One thing I'm concerned about is Donkey Kong Country, which was released to both the Game Boy Color and the Game Boy Advance. The former is inferior, but why would Nintendo release two versions of the same game? I think Nintendo would rather release Donkey Kong Land.

They don't release two versions of the same game. They didn't for the Wii - Wario's Woods and Yoshi's Cookie was only released in their NES versions despite the SNES versions being superior. Whichever version they release, they'll likely still release Donkey Kong Land too since they are not the same game.

One game that we'll never get is Tetris DX,

I'm thinking we won't see any Tetris game on the 3DS Virtual Console. We didn't on the Wii Virtual Console. The Tetris Company are quite particular about what a Tetris game plays like and the old versions don't feature the new mechanics.

Nintendo will want to be careful. If they release too many 3D classics, the Virtual Console is going to get jealous and explode in anger. That explosion will awaken Skynet an usher in the doom of humanity.

All of this due to a 3D remake of a game called Urban Champion.

Could be.
But i'd really love to see the original Tetris released as a VC title. Nostalgia goes a long way for that tile and could make it sell like hotcakes. On the other hand it could be that licensing / legal issues are a problem here.

3 words STREET FIGHTER II

That's Capcom, not Nintendo.

Wut?

So? Xevious is Namco, and Urban Champion is Arika.

Arika ported them, but Nintendo is entirely responsible for inventing Urban Champion.