It must have a peerful GUI toolkit...
  A well-designed multi-platform abstraction is ideal.

No one wants to write a RAD IDE in beautiful D using horrible Win32.
  Using D with the Win32 API is a horrible mismatch.

A RAD IDE would come AFTER the GUI toolkit abstractions.
  If Borland took up D, it could be absolutely perfect...

Do these things, and become rich.