I heard from a colleague today that the 2013 version of the Revit family of products will require SERIOUS computer power. If this is the case (we should find out in April), then AutoCAD-based products might require stronger, faster, bigger computers to run as well. I noticed a huge drop in performance on my laptop between AutoCAD 2011 and 2012. My desktop systems run AutoCAD 2012 and AutoCAD Map 3D 2012 fairly well even if they are 2 and 4 years old respectively.
Are Autodesk, Microsoft and other companies' product offerings getting too big and too demanding for the ROI (Return On Investment)? I am not in a production environment but if new hardware is needed to run these various packages, then budgeting for these needs will be very important during the migration period.
With the fall 2012 arrival of Windows 8, I suspect many companies will wait until the year 2013 and migrate to Windows 8 and Autodesk 2014 products and skip the 2013 products altogether.