We left before halftime yesterday. Wife and I normally take it in turns as we have a 3 year old and 3 month old. Thought we would see how the 3 year old does in our normal seats (315) yesterday, as he did well and enjoyed it in the family stand last season. Baby slept in carrier the entire time but 3 year old was flitting between overwhelmed and bored. Bit of a disaster. Back to wife and I alternating. That's on us and won't happen again, but on a champions league night for example or 8 kick off I will have to leave early to get back to the family these days (unless on supporter club coach).
Point is, before I had kids I'd be leveling accusations at early leavers and empty seats.
Now I have kids and my priorities have quite rightly shifted I can understand why someone might have to leave early as the infrastructure around the ground is fucking shocking. Bottle necks everywhere, be it by foot, car, tram, bus, etc.
If you want the ground full until the end the club needs to sort it out,not the fans. Invest in proper plans and links for stadium egress, work with the council and transport for G. Manchester. Sort the beer queues out (they almost did in ssl3 with tokens and now they've fucked that up too). Lower ticket prices and get younger teenage-under 30 supporters in the ground. Most importantly invest more money into the match going experience for the average fan who contributed to the atmosphere instead of throwing 99% of their stadium budget at things like hospitality boxes and tunnel club bullshit that does fuck all for atmosphere.