Maybe when it actually boosts real world benchmarks.
Maybe once drives start shipping with it enabled, so you suffer a massive performance degradation without TRIM being called by the OS (since the firmware isn't collecting its own garbage).
Maybe once Intel can ramp up their production enough to take OEM customers for their SSDs and it can really go mainstream.
... but if you really care about X11 support, you should probably be using the XQuartz releases anyway (http://xquartz.macosforge.org/). They're still "official", just not guaranteed to be as stable as OS updates.