Once Cycles has light trees, BPT will be firmly obsolete (because instead of the sampler trying to sample all lights at once, it will intelligently choose which light gets sampled for which light path).
Some of the newer papers on many light sampling give truly spectacular results that are more or less foolproof, the smarter sampling even applies to light from emission meshes (which BPT can’t do).
It is on the roadmap along with path guiding, these are two things we need to encourage the devs. to get started on ASAP.