Do clubs really need to continuously upgrade to shiny new stadiums though? I don't think so. I think decent facilities are fine. Stadiums should be ...THis is a stunning development and shows we have to really push the boat out in developing the Etihad if we want to compete on and off the pitch with the best.
1. Safe for everyone (easy entry and exit, secure, monitoring, police, stewards, etc)
2. Relatively comfortable seats with good views
3. Conducive to a good atmosphere
4. Good facilities (toilets, sanitizers, water, heat/cool, etc)
5. Good hospitality (music, food, tvs, communal areas)
We have all that and over time each can be improved. Most clubs have decent stadiums for where they are. A few (like united) seem to be behind and need a massive redo. If we fall behind others it's not a big deal imo.
Maybe I'm wrong though.