1) Only if we really can do that, I've yet to hear about staves (why is my spelling control telling me staves dont exist but staffs do?) with no magic on it.
2) That warrior wont be as powerfull as a mage, since a staff can only use 1 magic, mages 40+40+40 spells. ofcause warriors could carry more then 1 staff, but I doubt they will be able to find the pockets for 120 staves.
That would be pretty lame if you can't create your own staves and enchant them with what you want. I'm pretty sure you could even do this in OB, just like with weapons. You might be right in that there are no "blank" staves, but I'm sure you'll be able to replace the magical effects that are there with your own through enchanting.
And I didn't say the warrior would be as powerful, I just said his staff would be. I know most mages would probably also be enchanters but it doesn't make much sense to me if a mage that has 100 skill level and a good chunck of the perks of say Destruction, Conjuration, and Restoration, has a staff that is no more powerful/effective than a warrior that has 100 skill in one-handed, block and enchanting.
I don't even ever play straight mage characters but I can tell you if I did I would be pretty dissapointed if my skill with the magical arts had no effect on how powerful the magic that came out of my enchanted staff were, and that some brutish Nord greatsword-swinging wild man could have that very same staff and be just as effective with it because he has skill in enchanting, even though he couldn't cast any of my higher level spells, or with any effectiveness.