Agreed, this is too little too late.
We're about to roll out a major maps-based feature that we've been working frantically on for the last several weeks (a yelp-like discovery system for amateur athletic events). Despite having extensive past development experience with Google Maps, the price forced us to go with an OSM-based system (MapQuest tiles + Leaflet).
The surprise? Leaflet/OSM is actually a lot nicer to develop against than Google Maps. Leaflet is a superior API, and the fact that it's open source means I'm never left wondering "WTF?" when there is some strange drawing glitch. I'm never going back.
There are a handful of features that Google Maps provides that OSM does not, and the quality of the Google geocoder is slightly superior. But for drawing a map and icons/polygons, scrolling to determine search bounds, etc, OSM is a superior solution. I would never have discovered this without getting "pushed out of the nest" by price.
One catch: To do HTTPS, we have to proxy the tiles. No big deal.