As both a professional musician and a practicing Catholic, I have to consider some things.
1.) Practically anyone who can perform this piece well will expect to be paid well for it.
2.) It is so long that it will definitely be the center of attention. A properly-proportioned Mass that included this in its entirety would be so long that few people would come.
3.) The Catholic culture in which this type of music flourished has never been part of the United States’ culture. I don’t think it would have fit well here in the pioneer days of the 1700’s, and I don’t think it would fit well here now.
We should appreciate the arts and the impact our Catholic heritage has had on them, but not everything Catholic that we do has to take place at Mass. Sacred music concerts are wonderful, but why compartmentalize the things of God into one hour on Sunday? If people want to celebrate God by having a sacred music concert, then they ought to have one- but why does it have to be at Mass? The apostles didn’t just talk about God in the temple.
No, it’s too long and too showy for Mass. The only time it could be appropriate in a church is if a group of musicians decided, for the Glory of God, to go into the church where there was no congregation and perform it by themselves as an offering of their very best to God.