Absolutely, I probably know most of his promises from the top of my head. The problem is, currently we have no way to check what was true from his speech and what info he is holding back. So right now, he's our best shot.
Depends on 1) how seriously Bethesda take this feature and 2) if there will be real, working economy. Which I highly doubt because various reasons (I bet there won't even be mills to be destroyed!), but who knows?
What's confirmed already is that settlements can attract people with better stuff (I don't know if they're going to be specific vendors or simply wastelanders) but you have to provide protection and resources to them.
I agree with this kind of general approach, and I certainly hope there will be jobs to be assigned and thus wastelanders with different proficiencies. Also, make sure we can indeed use the loot gathered from dead Raiders.