In my opinion, tradition will return to the Church eventually. Updates will then be required on the 1962 Missal, such as the latest Saints.
Improvements could be made, such as bringing back the previous Holy Week liturgy, but at the new times, and returning to the priest saying the Gospel sotto-voce during High Mass.
Modernisation would not be required in any way shape or form. Some of the suggestions of Vatican II on the liturgy could be considered, perhaps in a similar fashion to that which Msgr. Gamber outlines in his book ‘The Reform of the Roman Liturgy’. I.e., restore the liturgy… make it more solemn and even more beautiful.