Although I admit I hadn't heard of Habermas prior to this question, it can't be denied that he is an important figure in Apologetics, as evidenced by him being in the top 14 authors by number of index references in Groothuis's textbook Christian Apologetics.
The Minimal Facts Argument (MFA) does not exist in isolation. It is a specific form of apologetic argument in the broader approach of Evidential Apologetics. Habermas is not the only proponent of this approach, and though I don't know who first developed it as a distinct approach to apologetics, Habermas is the youngest of the proponents listed in Wikipedia, making me think it's pretty unlikely that he was its founder.
Evidential Apologetics itself is really a development of so-called Classical Apologetics. Groothuis explains their relationship as follows: Classical Apologetics has a two-step strategy: arguing first for a monotheistic God, and then for the particulars of Christianity, focusing on miracles, the incarnation, and the death and resurrection of Jesus. Evidentialism has a one-step strategy, jumping straight to the argument of the historicity of Christ and the resurrection, its proponents arguing that the fact of the resurrection is enough to bring someone directly from atheism to faith in Christ, without needing to be convinced of theism first.
It is natural for Christian apologists to give a heavy focus to the death and resurrection of Jesus - it is the centre of our gospel of course! More than that, it seems to me that the MFA is really just a particular formulation of another common argument, often called the Transformation of the Disciples. Two popular pop-level apologetics books, Josh McDowell's Evidence Demands a Verdict and Lee Strobel's The Case for Christ each include it as part of their Cumulative approach to apologetics. McDowell quotes none other than John Stott saying "Perhaps the transformation of the disciples of Jesus is the greatest evidence of all for the resurrection", and Strobel interviewed J. P. Moreland who says that his first line of evidence for the resurrection is the transformation of the disciples.
Furthermore, it is also quite common for apologists to present first the extra-Biblical evidences for Jesus. Though many have written on these topics, few do it as well as John Dickson's The Christ Files, which considers in order the secular Greco-Roman sources about Jesus, then the hostile witness of Jewish sources, before finally considering the Christian witness.
In summary, The Minimal Facts Argument is unlikely to be revolutionary within Christianity because it is far from a revolutionary argument. The ideas it conveys are actually well recognised and are given a place of top importance by many apologists. (For this reason I'm highly doubtful that you can attribute the change within secular academia of almost universal acknowledgement of the historicity of Jesus to the MFA.) The MFA is one way of building an argument on these facts, but it is not the only way to do so. And because most apologists do not subscribe to the Evidentialist approach, I think the specific form of MFA may end up being overlooked compared to those who present the very similar Transformation of the Disciples argument within a Cumulative approach.