I’m opposed to increasing the field. I don’t want teams under .500 getting in and that’s exactly what the large conferences would be pushing for. I do have a problem with other things like the NET and every once in a while the committee goes insane, but the tournament is still the best event in all of sports, IMO. Now my friends have been using the term “March Sadness” due to the increasing lack of Cinderella stories.
As for changing the calendar, I think every hour of every day have been fought for and negotiated between sports executives and media so much so that it would be nearly impossible. Spring for one has been owned by the Masters for decades.