Some have mused that another company has bought enTourage, and that enTourage will continue to hum along.

If you want to see what a normal tech takeover looks like, look at http://www.stardock.com/about/newsitem.asp?id=2558.

enTourage is not showing any of these characteristics.

True, someone may have bought enTourage, but likely with no intent for enTourage to continue operations, or even its products to continue to develop (otherwise why can you no longer buy or even read about the eDGes on the enTourage site?).