At NLM Peter Kwasniewski has a piece about how concelebration has been and still is being forced on priests. For some, this is almost a mania and you incur their wrath if you don’t con-comply.
I say that concelebration should be “safe, legal and rare”.
Clearly, the modernists and progressivists are fuming and plotting against the young priests going to side altars to “say Mass,” or the parochial vicars who set up dignified altars in their rooms for their day off, or the clergy who with curious consistency absent themselves from the sacramental jamborees that pass for special occasions like the Chrism Mass. They can see the writing on the wall. There comes a time when the threat of tradition becomes felt in earnest, and all kindness, real or simulated, is laid aside. It is indeed a threat to the postconciliar house of cards that many have substituted for the rock-solid Church of Christ and its perennial doctrine and liturgy.
The older generation, still paddling and sputtering in a lake of Kool Aid, wants to thwart the revival of private Masses  above all because these Masses are so often in the usus antiquior. Thus, two canonical offenses are committed at once: an action against the Code of Canon Law, and an action against the motu proprio Summorum Pontificum and its authoritative applications in Universae Ecclesiae.
Let us, them, be as clear as we can be. It is impossible to force a priest to concelebrate, even to establish that he should “as a rule” do so. It is still more impossible to exclude the usus antiquior for a priest’s “private” Mass — that is, when he is not scheduled to offer Mass in public with a congregation. 
Yes. I believe that there is a connection between the waning desire to concelebrate and the waxing use of the Traditional Mass.
I was recently at a wonderful conference for priests. I had written that, before I went I had inquired about the possibility of celebrating Mass on my own, and indeed the TLM. The organizers could not have been more gracious and accommodating.
Thereafter, quite a few priests at that conference asked me what my arrangements were. They, too, would have preferred to celebrate Mass on their own, rather than concelebrate, and indeed most of them in the Traditional manner. It was enlightening.
I mentioned this fact to one of the organizers and we had a short chat about how that could be done next year with the addition of individual altars. My suggestion was that they could obtain, perhaps, 4 or 6 of the altars by St. Joseph’s Apprentice and, as I do, assemble a set in a Pelican case. Thus, could they easily store and transport them.
In any event, the younger clergy are not slaves to the aging hippies and their acolytes who are basking still in the halcyon days of the spirit of Vatican II.