Well I have to disagree with you on that; in my opinion, having visited traditional Latin masses, the piety is sincere and not motivated by nostalgia but rather by an appreciation for the liturgical beauty, which has also stimulated interest in the Eastern Catholic and Orthodox churches.
On the whole, as Archpriest Andrew S. Damick of the Antiochian Orthodox Church stated in a recent podcast, there has been an influx of converts into all of the more traditional churches of late, and movements into more traditional churches within denominations.
The laid back style of worship that became prevalent in the late 20th century is now becoming increasingly unpopular, as people return to a desire for a more reverent style of worship focused on liturgical beauty.
And frankly, while the Tridentine Mass does have some problems I would argue, it is vastly superior to the Novus Ordo. It has a more focused one year lectionary, more consistency with the Byzantine Rite in its pre-1955 form, in the Paschal Triduum, which closely follows what we do for Easter, and it has the elegant style and construction of prayers that characterizes the traditional liturgies, albeit it is also known for being concise and to the point, as opposed to the more flowery and poetic language one finds in the Mozarabic and West Syriac rites, for example. I happen to love both styles by the way.
A major reason why I am supportive of the TLM is a desire to preserve the beautiful liturgical heritage, which is extremely solemn, and generally edifying. Most of the problems with the Vetus Ordo involve not the Mass, but rather the Divine Office, and the Novus Ordo’s attempt to fix that with the Liturgy of the Hours sadly has not worked. The Divine Office remains largely a private devotion for priests, and the only public services one finds at most Catholic churches are either the Mass, or devotional services like Holy Hour and other forms of Eucharistic devotion, and the Rosary or Novena, but it is a real shame that so few parishes celebrate Vespers or the Office of Readings, as Matins is called in the Novus Ordo Liturgy of the Hours, and almost none celebrate any other offices. Meanwhile Anglicans and Orthodox continue to get good attendance at services like Vigils, Evensong and Compline. That’s really the big elephant in the room, and changing that would be a huge improvement whether it involved the Novus Ordo or the Vetus Ordo, although I don’t really like the Divine Office from either rite that much; rather I think the Dominican Rite liturgy and the traditional Benedictine Divine Office (which is normally celebrated along with the Tridentine mass) are much better. Also, there are the beautiful Little Office of the Blessed Virgin Mary, and the Office for the Dead, which are beautiful prayers, and it is a real tragedy these are not more readily available, as they are much simpler to do than the regular Divine Office or the Liturgy of the Hours.