It is interesting for me to read about Baader-Meinhof here. I think McGrath is completely right with the analysis of the deeper reasons for the end of that group ('gang' was the official German PC term).

On the surface, however, like the timing of the end (why now and not two years later) the end of the GDR had a minor influence.

1990: the end of the GDR
1992: the Kinkel initiative in which Kinkel offered freedom for some of them for the end of violence (I guess the end of the GDR gave the West-German government the inner strength to make that offer at that particular time)
1992: renouncing violence by the RAF in response to Kinkel
March 1998: official end of the RAF 'today we end this project...the result (of our fight) is our harshest critic...the unification of the Bundesrepublik and the GDR required a new and international liberation project...(To try do do so in the 90s) turned out to be unrealistic'

But despite their rhetoric mentioning the GDR, the deep reason for their demise has been hit by McGrath. Teribus might have a minor point re the actual timing of what was unavoidable anyway.

Wolfgang