If at all, then only as an indirect effect. I haven't really noticed an uptick in contributors since then. There has been more publicity and more people using it (and abusing the community-run openstreetmap.org tile servers for commercial purposes²).
² It's fine to use OSM for commercial purposes, but hosting the tiles costs bandwidth and computational power. Embedding the community servers in your taxi tracking product and refreshing the page and map background every second is just a dick move.
