To your original question re any announcements by Adesk about retiring ACA, no I haven't heard anything, but all the dealers keep telling me 'revit is the future'. They of course want the upgrade and training dollars. I've used both and tried implementing it in a company I worked for. Because ACA is based on acad it was difficult to get everyone to move to 3D. Not everyone shared my enthusiasm for the progression. Revit is a totally new way of doing things and must be used in 3D. If it's just you and a few equally skilled operators who are willing to 'learn' and progress then ACA is fine. There is a steep learning curve for both programs but it's well worth the effort.