I wonder if we'll see this happen in Orthodox communities as well. It seems like there's the same potential for toxic perfectionism inherent in Orthodox theology (not that I think a Sola Fide system can't be vulnerable to that as well).
While I think Orthodoxy is potentially ripe for fanaticism (especially among converts... I speak from firsthand experience here observing it). For many cradle Orthodox, it seems to me the religion is heavily about ethnicity more than precise theology and the beliefs about saints and prayers for the departed covers a lot of worries about individual sins. There is also the concept of diakonia or "vocation" (in western Christian terms) that tempers the asceticism. In most Orthodox countries, it seems that most people don't stress to much about fasting or attending church, even if that is the "ideal", and a lot of the religion seems passed down through other institutions, such as the family or the state.
Mormons, on the other hand, seem to be on a whole 'nother level of perfectionism. Utah also has some of the highest rates of anti-depressant use in the US.
Most Protestant denominations and non-denoms, either work against or deny sola fide
, at least in practice. But they aren't as ascetic as Mormons or Orthodox, so it doesn't reach a toxic level unless you are in an oppressed minority group (single mother, gay, etc)... then in that case, why even bother with religion?