That "they lack the bravery to confront (or are uncomfortable confronting) new challenges" seems unlikely given the amount of work it takes to assemble the rubrics, the accoutrements, and the training that goes into putting together a traditional liturgy, not to mention the battles with each diocese's "Fr. Anthony Ruff", who is steeped in liturgical inanities he learned at the knee of the Benedictines in Minnesota.

Your assessment smacks of projection of dislike of the youngsters, or traditional liturgy, or both.

It is more probable that the inherent human desire for mystery and transcendence is surfacing, just as it did in the Anglican Communion during the 19th century, including prayers for the dead in the Church of England after WWI. People innately want the sacred.