Every morning we say to our Lady: " ... et mihi, misero peccatori, et sacerdotibus omnibus, hic et in tota sancta Ecclesia hodie offerentibus, clementer assistere digneris ...".
I presume the hic takes us back to the happy days of busy altars; when priests queued up to say their Masses; when all around a church was the Missarum sacra murmuratio and the occasional sound of bells. Happily, the current Code of Canon Law made the saying of Mass without the presence of a lay person to answer rather easier; hitherto you needed a gravis causa; now a iusta causa will do, and Bishop Peter Elliott (who did his seminary training at the same place, S Stephen's House, as I did) explains in his Ceremonies of the Modern Roman Rite, that a priest's desire to maintain the discipline of the daily Mass is a thoroughly iusta causa. Our Holy Father has continually emphasised the importance, in the Latin Church, of this discipline. Yet so few clergy seem to celebrate except when there is a pastoral need for them to do so. How depressing.
O'Connell gives in detail the decrees of the SRC about how you celebrate without a person to serve or answer, in the EF; it's all very common sense. And the Novus Ordo rubrics also provide for this possibility. Is the spirituality and discipline of the daily Mass in the life of a priest properly inculcated in modern seminaries?