The TLM was never “dropped.”
In the years after the council, actually even during, liberties were taken to change the superficial nature of the Mass, people responding to the prayers, priest facing the people, introducing vernacular little by little, Latin was dropped from schools, etc. Very few announcements were made from bishops as non-uniformity became the new game, even from parish to parish. The period from 1964-1969 was a transitional period but no one knew what the final outcome would be. It appeared that the Catholic Church was really losing a grip, and this appeared evident when a more permissive attitude developed, meat abstinence rules were dropped, communion fast reduced, Saturday Mass counted for Sunday, artificial birth control became only a conscience issue, and so on. (It didn’t help matters that the Church was reported to be involved with lots of bank and sex scandals but that’s another matter.)
By 1967, it became evident that the liturgy was in a complete chaos. We just didn’t know what to expect when we went to Church on Sundays. The Novus Ordo was introduced in 1969 just in time to quelch this chaos. Personally, I felt it was sorely needed and was relieved that some order was finally restored. The rest you probably know about.
What the Pope did in 2007 with the SP was a very brilliant move, bridging the old world with the new. I think we should appreciate him for that. Though we may still have our preferences and only attend either one form or the other, at least folks on each side of the aisle should now embrace and forever hold their peace. Is this possible?