I like the way this sounds, like it a whole fucking lot, but I think it may.... leave something to be desired. See the draw in Fantasy Football, at least for me, is not only the picking, looking at stats, decisions on who to play based on any number of things, but the ability to, and here's the kicker, watch something I already enjoy.
I'm not honestly sure if anyone plays Fantasy Football without actually watching, or at least following the games. That's what makes it exciting. It's an extra... cherry, on something already great.
So, like I said, great idea, but I don't know if it can stand on it's own. It's basically just a battletech, or warhammer(40k/fantasy) campaign with a different skin.
So my suggestion, as it is, is to add this to a pre-existing game. Test drive it so to speak, and this is getting tl;dr, so bear with me.
I always have had kinda issues with high level characters in RPG's. They can move mountains with their biceps or minds, but they always seem to have to do shit for themselves. Leadership was only used for the Cohort(in the case of DnD), people could worship you like a god, but so what?
Here is where your system comes in. Use it like an add-on to a generic fantasy RPG. During the course of the game, as you level up and grow more prestige/fame/whathaveyou, you get more and more people to play with. You can use the time between sessions to customize your followers/cultists/worshipers, and send them on missions. Raid a dungeon, convert a town, research something, you get the idea. Use your tables and roll that shit up.
Players that are careful and invest money and time into their little band may find themselves knee deep in political favors/sway, gold, magic items/spells, or favor with their god.