Nostalgia drives liturgical change as much as it drives musical entrepreneurship. What songs warm our hearts? What reminds us of grandmother? A song might symbolize an imagined, more perfect, time in the church. Nostalgia and utopian dreams of the past collude and what emerges is new liturgy.
The new is born of ideations of the old. The new is born of nostalgia as much as anything else.
Of course, most of us are nostalgic for times and places that are irrecoverable. How we partake of the table feast is predicated on what moves our heart. And it is mediated by the liturgical power structures of our own traditions. Perhaps you have a prayer book like the 1979 Book of Common Prayer. So, you try to create a liturgy for both you and your grandmother even though your grandmother still perceives the 1979 Book of Common Prayer as an innovation and not the church of her childhood for which she too is very nostalgic. She misses her parents. She misses her grandparents.