Would you buy a complete version of Super Mario Bros. 3?
SMB3 is the most popular game ever made and it's had quite a few rereleases but never a complete one, at least not outside of Japan. With talk of a possible Virtual Console port for the DSi, would you want to pay for a complete version?
By my definition, a complete version would include:
The main game in 16-bit graphics and sound
The battle mode from the SNES version
All the hidden E-Reader items and switches (vegetables, cape, boomerang, harder enemies from SMW, Mario and Luigi play differently, etc.)
All 40 e-reader levels from the US and Japan including the demo levels and the real final level (a showdown with Bowser on the Airship that's sunken in SMW).