Team meat has stated in an interview in Nintendo Gamer magazine issue #72, that Super Meat Boy would have came out on the Wii if the file size limit wasn't just 40MB.
[WiiWare's] 40MB is horrible, but [3DS's] 2GB is reasonable. Super Meat Boy would have been on WiiWare if we could have had just a few more megabytes of space – you can only compress stuff so much before you have to start cutting out huge parts of your game. Unfortunately, at that point, it just isn’t worth the time.Personally I think that the 40MB size is a joke of a size, and with the 2GB limit it will really get the ball rolling for development of some good games for the 3DS eShop. Also, people will have to start buying a new SD card because the one that came with the 3DS is only 2GB. They also state that they would like their future games to be on the Wii U. However, there are rumors that even the Wii U is to only have 8GB of internal storage - so you better get out a spare SD card then too.