I do have some sympathy for the reasoning of their Lordships at the time that, with a low adherence of the faithful to the practice of the obligations on a Thursday, the transfer to the Sunday would make it easier for the faithful to celebrate these Solemnities. There appears to me to be some analogy between this motivation and one expressed by Pope Benedict XVI in his letter to bishops accompanying the Motu Proprio Summorum Pontificum:
One has the impression that omissions on the part of the Church have had their share of blame for the fact that these divisions were able to harden. This glance at the past imposes an obligation on us today: to make every effort to enable for all those who truly desire unity to remain in that unity or to attain it anew.But, if I remember correctly, the Bishops Conference also intended that, in making the change, the faithful would celebrate the two Solemnities with a much greater appreciation of the mysteries that they celebrate. That requires that the Solemnities are celebrated at parish level in a way that makes rather more of them than the adjacent Sundays of Eastertide or of Ordinary Time.
In the parish where I most often go to Mass, though, today's celebration of the Ascension has been overwhelmed by the fact that young people in the parish are receiving Holy Communion for the first time at the principle Mass - and the same will happen again next Sunday on the Solemnity of Pentecost. I suspect that this is not unusual around the parishes of England and Wales during the "First Communion season". It does mean that the intention that a celebration of the Ascension on a Sunday would lead to a greater appreciation of the mystery being celebrated has somewhat gone by the board. The association of First Communions with the Solemnity of Corpus Christi works, as does the celebration of Confirmation on the Sunday of Pentecost, though an attentive linking of them to the mystery marked by the Church's liturgy of that day is required if the Bishops' intentions with regard to the faithful as a whole are to be met. The Sundays of the Ascension and the Trinity, though, are not the right days to use. There appears to me to be a significant discordance between Episcopal intention and parochial practice.
As the conundrums represented by the move of the Solemnities to their nearby Sundays comes round each year, I have reflected, too, on the way in which those with attachment to the Extraordinary Form have continued to celebrate the two Solemnities on Thursdays, almost as a way of getting round the Bishops' decision in this matter. Until such time as the calendars according to which celebrations in the Extraordinary and Ordinary Forms are determined are brought together, it would be a gesture in favour of ecclesial communion if celebrations in the Extraordinary Form complied with the calendar being observed in the Ordinary Form in so far as these two Solemnities are concerned.