This explanation, though very plausible to the plate tectonics way of thinking, is hard-pressed to explain:

1) Deep hypercenter earthquakes (e.g. 500+km deep)
2) Earthquakes occuring in zones where no known faults have been discernible (though it seems a (deep) "rift" is then hypothisized to explain the matter I believe).

I think plate tectonics theorist offer the idea that the deep hypercenter quakes are actually of a differenet nature than the near surface quakes...this dodges the bullet generally (for now). Same for (deep) rifts in areas that are not near known plate boundaries.

These descrepancies sometimes lead intuitive folks into speculating that perhaps there may be some combination or a completely different mechanism at work (which may explain some of the other paradoxes as well).

Further complications in resolving the matter (In the mainstream arena) involve social / political issues in openly embracing other ideas without it having been buttressed with significant data to the contrary and which does a much better job at explaining all of the phenomena.

It is legimate, I think, for an individual (especially a geologist) to weigh this matter accordingly to their career goals, etc. while perhaps "Unofficially" entertaining other ideas and concepts (perhaps in stealth mode in some cases...).

This type of strategy could be a win/win situation as it creates a safety zone for the individual(s) involved yet allows the possiblity of sporadic stop and go motion towards "wherever the data/science" leads...which could ultimately "break the problem wide open"...and allows a pathway for the mainstream thinkers to migrate over to a new paradigm (which is forced since no one wishes to be left out in the cold perhaps still criticizing a concept which has now bloomed into the "frontrunner"...).

BTW, these are just general statements (and not directed at anybody in particular).

BTW2, the new leaders (in any field) are the ones who have cognizance and awareness of leading edge activities (however dismal their odds of success appear) so that they are able to display such knowledge at the right time (hopefully to be recognized and advanced accordingly). This statement is directed at Lowell, whom I believe is one such leader. While I had first labelled him as a "mainstreamer" initially, I see that he has proven himself quite well in this area and is open to considering and investigating other approaches.... Bravo/Kudos/Way To Go :)