Based on newegg.com cheapest in-stock item:
Blu-Ray Burner $169.99
DVD Burner $23.99
I think unless you have a need for Blu-Ray it still has a ways to go before we hit mainstream in PC's. Plus 119% is impressive, but it is revenue. So that probably includes every PS3, PS3 game, Blu-Ray movie, etc. If you went with stand-alone players/drives by count I think it would be far less impressive than the revenue increase as a percentage.
Essentially (IMHO) a Blu-Ray drive is worth it if you either need to archive large projects to disc, or you want to watch movies in Blu-ray, otherwise you might as well wait for prices to drop.