I've never used SharePoint either professional or personally, but from a first pass, high level perspective, it doesn't represent much in terms of a threat to weblogs... The tool has a complete dependence on Microsoft tools like SQL Server, ActiveX, Front Page, whathaveyou... many of those have implied platform costs.

Regarding MT -- do you realize that, pre-2.5, the program was written by ONE GUY (Ben Trott) in Perl? Zounds.