This I will argue about, you do use a program everyday that will do it all in AutoCAD, but it doesn't do it as well as ADT can... or Inventor... or Revit... or ArchiCAD... or Solidworks or...
Yes, it can do a wide variety of things better than anything, but it can't do specific tasks better than most task related programs. No matter how much you customize AutoCAD (unless you use a 3rd party program), I'll likely finish a project first with a highly customized version of ADT in drawing a building.
That's not a knock against AutoCAD, its versatility has long been its greatest strength! Yet when it comes to aiding in structural calculations, heat loss totals, mechanical engineering... it simply does not currently have the data required to speed these processes along like the "BIM" solutions.
So I'll agree with you, if Autodesk ever enables AutoCAD to do this then no one will question its worth...and Revit and ADT would be much more likely to team up. If it doesn't, then I can't see them ever merging.
Thanks for letting my comment in the previous post slide!
I think we basically agree!