Johnnykins:
I agree we do not need two churches - but I point out that having more than one liturgical form is standard in the Catholic Church. (As a monk I’m sure you heard of the other rites in the Eastern Church as well as the allowed rites within the regular communities on the West).
At first glance, this seems like good reasoning, but after thinking about it a little more, this may not be a wise solution - to splinter the Roman rite church with multiple choice liturgies.
While it is true that there are other allowed rites within the West, as you stated, I have never seen these churches offer rites in splintered form. At one time while serving in the Maronite rite church in my area, it is well-known that this rite is the
only liturgy offered for the parishioners. To accommodate others who may desire the N.O., they must attend another church which celebrates this liturgy. The clergy do not bend to the wishes of the congregation to offer a separate mass for the parishioners who dislike the Maronite rite.
Even though the clergy may no longer need permission from the bishop to celebrate a TLM, I doubt that a pastor would arbitrarily impose two liturgies to please everyone in his parish, unless there was a large number of parishioners who desired the TLM mass. Our pastor was approached at one time to consider having this on occasion, but the majority of the faithful were not in accord, other than the one small handful who requested it. One must also consider the willingness and capability of the pastor to celebrate in latin, for many elderly have passed on and the newly ordained are not trained in this.
The pastor is obligated to celebrate the liturgy that serves the majority or the
common good, not the minority. It may happen some day that there will be separate churches that offers the TLM exclusively, similar to the Maronite rite that uses solely its own liturgy.
Another consideration is that the vigil mass on Saturday is a real benefit for many who have working or other obligations on Sunday, so I doubt this would ever be offered at the vigil mass. For parishes with only one pastor, that leaves two masses on Sunday morning. Again, how many would be upset to be relegated to one time only for their mass due to a TLM being offered as a regular liturgy.
The consideration of adding missals for the latin rite is also another problem. I know my church has no room for another missal, for they use two worship aids already and a third would complicate things.