I'm inclined to remove plot collection before yt 3.0 is released.
PhasePlot and ProfilePlot both work in 2.6, and we've actually seen
quite a bit of migration to them.
If there's enough support, I'll bring this to a YTEP and we can hash
it out there, but before I went to that point I figured I'd look for a
handful of +1's here.
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