I think technical PMs or product oriented developers are the future most valuable people.
It's pretty normal for integration projects with big corps to have problems, but if the project has executive interest and the A-team gets called in, it's a joy to work with those people. The lines between the roles are blurred, it's just smart and dynamic people making things work. They don't give a shit about following scrum or pedantic coding standards, only project success, but not in a superficial way. I don't know if they truly care about what they're doing, but they're so far above the baseline that it doesn't really matter.
Maybe. Maybe not. Sometimes you have to see it to understand what's wrong / how can it be improved. It's one of the actual benefits of pre-religious agile - have something in front of your sponsor ASAP, adapt to their feedback. This loop can be made faster, but you'll still need some expertise at every level. Just not so many bodies.