The New Mass will slowly die, I believe.
Those raised in the New Mass generally know less about the faith, are more likely to either leave the faith outright, or marry outside of the faith and will generally have the minimum amount of children even if they stay.
Those raised in the theological richness of the Old Rite will be more likely to remain faithful, to marry among the the faithful and to have many children.
Simple arithmetic will eventually prevail.
It's a hard thing to be so far away from your community... I don't care about the coffee and donut thing (I never go to that anyway) but it is nice to be able to show your kids that others that they know live their lives as Catholics. When we go to the Tridentine (which I love and my kids are getting more and more out of especially since my daughter is taking Latin this year) we don't know anyone and we live too far away to really be a part of that parish.
Only about 50-60% are marrying in the Church, and only 70% of those to a Catholic, and 20% of the total has been divorced.
Of those remaining within, they are averaging currently 3.4 children per marriage (compared to right around 3.85 per marriage during the Baby Boom). See here.