Some have left for the FSSP, but I don't think it was due to the "excommunications," or at least not solely because of it. They left before the consecrations happened. The FSSP has an apostolate not far away; large Gothic church aquired from the diocese, 2 priests, convenient mass times, and full parish life. We have low mass on Sunday afternoons, soon to be decreased to bi-weekly due to attendance.
However, we have been seeing a slow trickle of new faces and returning former ones since July 1.