I would play it, in fact recently I was suggesting similar server type, skills of all classes rolled into one universal char class.
Of warrior only server, I have dreamed also but only privately I think. You would have no class balancing to worry about and designing mob AI could be done much better way, not like now when you need to take into account various classes so none can exploit some loopholes. You inevitably end up with some caves & subs & bosses being geared to some particular class.
To make it more interesting, to get more pple to try it, you would need to add some currently non-war skills to him. Also it should be some server like Sanjian is developing, with professions and such likes, rather than pure leveling and getting items from mob drops.
You get many veterans of only one class on any server and if they tried other class, they may come to think of it differently, than just dismiss it.