cantoresq, By Rav S.R. Hirsch supporting Hungarian Orthodoxy’s position, does not demonstrate any “implication” (your words) that his approach in Germany failed. It merely demonstrates that he felt it important to extend this principle across Orthodoxy worldwide. Additionally, you are fond of (correctly) repeating that there is no truth in numbers (i.e. being numerically larger doesn’t demonstrate being right), so even if most of German Orthodoxy didn’t follow Rav Hirsch in seceding (I don’t know the veracity of this), it would not demonstrate the correctness of his position.
Regarding the Status Quo Ante, they were merely an agglomeration of varied interests, and not any coherent or even organized group. Many Chasidic Kehilas, Debrecin included, were Status Quo. As time passed some of them formally joined organized Orthodoxy in Hungary.
As far as the Neolog, they’ve all but disappeared (something that DOES demonstrate their falseness.) They still have a large temple in Budapest, that may seat thousands, but I’d wouldn’t be surprised if they don’t have a minyan on Shabbos.