Consensus that fq_codel has been tested enough. We'll probably have that discussion at LPC at the end of the summer.
Note the fq_codel qdisc not a panacea: don't believe that just because it becomes the default, all your bufferbloat problems will go away.
There is lots of driver work left to do, particularly for 802.11, DSL, and cellular to name a few. Some of these drivers are closed source, and getting it deployed everywhere is going to take a long time even after they've been fixed.