1. When the level cap is raised to 60 in the expansion pack next year, SMN will get new summons. It has not been specified which they will get however. Leviathan, Ramuh and Shiva are 3 missing egis for 2 5 level ability slots.
2a. Not likely to get wind (that's Aero, a CNJ spell line).
2b. The elemental wheel was purposely removed. They considered elemental strengths and weaknesses to be too complex so removed them completely instead of just simplifying the system (there were two wheels at the time, astral and umbral). It's very unlikely we'll see any sort of elemental weakness system return while they're still in the simplification mind frame.
3. Not WAR as a DPS, it is a tank. We may however see a MRD (the axe wielding class WAR comes from) based DPS in the future, or an axe wielding DPS in general in the future. That has neither been confirmed nor denied, it's simply a possibility.
4. They like the GCD the way it is.
5. They're bringing in something like this in the expansion next year however it isn't pets, it's airships.
6. Again, they like them the way they are. Feedback has been forwarded to the devs about this numerous times however.
7. Not likely, they think it leads to harassment and abuse and the like. Just keep using your private LS.