This sounds like a nightmare - - - - - even more than the nightmare we already have.Imagine getting 6 or 7 FP per day in advance in exchange for no standby line options. Everything had to be booked at least 30 days in advance (so it can be adequately staffed per 100% known demand). No same day guests anymore. Your entire day appointment-only, rides, food, shows, etc. A specific number of allotted tickets per ride, per day, and once they were booked up then that ride closes off to any additional guests that day. Spontaneity only seems to add frustration in massive wait times, unknown crowd levels by the day, confusion once inside the park and 'what ride should we do next?'-type arguments. So lets get rid of all that. From the moment you walk into the park until the minute you leave there is zero confusion, nothing to consider, perfectly staffed rides so lower wait times, lower crowds getting rid of same-day guests. You could still aimlessly wander around soaking it in but there wouldn't be a random ride at the end of the wandering. Disney would love to have the elimination of all spontaneity so they can manage everything optimally. I thing this would A TON of the current issues and challenges facing the theme parks.
NO - - - keep the standby lines.
With a two year old we do lots of things, "off the cuff and on the fly".