The thing that gets me is - in order for G+ to work, Disney is going to have to make huge upgrades to their IT infrastructure.
- Upgrades to wireless connectivity and bandwidth in all resorts to enable mass connection attempts at 7 am
- Upgrades to wireless connectivity and bandwidth in all parks and parking lots to enable constant connections
- MASSIVE updates to their database functionality, speed, monitoring, etc to support the 7 am connection surge, plus DR backups
- Likely large updates to their log monitoring and troubleshooting
- Enhanced IT testing teams to support regular QA with every OS update on every phone, to make sure it all still works
Given Disney's lack of success in these exact things over the past few years, I think the first few months of G+ are likely to be really really ugly, with people unable to get on at 7 am to get the rides they want, freezes, query issues, etc.