<I'd like to see an ANSI standardized MCAD file format. Basically, a common file format that every MCAD package could read and write, including all the features and history. >
EDS-PLM (UG, and iDeas), Autodesk and PTC announced at back in Feb that they were cross licensing their 3D modeling
engines, so this is closer than you think.
Realistically, I see 3 directions in CAD
1) Broad collaboration - along the 'total building' that
AJUK mentioned. PTC's Windchill, Bentley's recent
Microstation and EDS-PLMs eViz are the first steps in
this direction
2) More and more automated wizards. You are starting to
see this in the AEC space, where wizards help with
HVAC routing and such. Soon you will see software
packages doing this automatically the way they currently
automate walls and such
3) A convergence of 3D 'content creation'. Companies like
Autodesk already own other 3D 'content creators' like
Discreet (they did the FX for Terminator 2), you are
going to see this trend accellerate.
With the advent of 3D printers, we aren't that far from
having 'virtual sculpture' of a component that is cheaply
rendered right there in the office.