New Game Mode Idea: League of Roguelike

First off, I apologize if this idea was already thrown about before on this board, but additionally, I apologize if I don't post enough detail on any of this.

So, basically this alternate game mode would play no different from how LoL normally does, but instead of fighting 3-5 other Champions in an arena alongside 2-4 allies, this mode has you and up-to-4 allies teaming up to go dungeon-crawling in a randomly generated dungeon with the floor count varying by difficulty(but would definitely be an amount greater than 8 floors, no matter what).

Each floor would be probably as large as the Twisted Treeline, with your team showing up on a random part of the map and having to hunt down the Stairs. The whole dungeon would contain a wide variety of always-hostile minions and monsters(some original and created for this mode specifically, but primarily ones from SR and TT) with enhanced stats(especially a great deal more Health, at least 3 times more per level), and occasional Champions posing as Miniboss-tier monsters(with skins to add to the look, and possibly pseudo-Doombot powers to make them more of a threat); to compensate for the way stronger monsters, everyone would gain some Gold on every kill so no one falls behind. On the very final floor, you'd be pitted against a final challenge consisting of either a large number of Champion-minibosses for a mock-teamfight, or a pair of Epic Monsters(chosen between Dragon, Baron, Vilemaw and an original Epic Monster designed for this mode), or some combination of the two(most likely with minions and other lesser monsters pouring in to add challenge).

On the subject of being slain; if you're part of a team, you'd be capable of respawning(whether via a timer like normal LoL modes, or an ally interacting with your body)... But if the whole team dies before anyone can be respawned(or you die at all if you go it solo, assuming that is added as an option), it's a proper Game Over. Also, any and all abilities that normally don't affect minions/monsters(Ezreal's W, Garen or Karthus' Ult, all offensive Summoner Spells except Smite, etc.) would be able to target/affect the non-Champion units, acting as they normally would on enemy Champs; abilities that deal bonus effects to minions/monsters(Fiddlesticks' E, for example) would retain those bonus effects.

There would be no fountain except before the final challenge(so you can heal up), so most Champions would have to rely on their own natural Health/Mana Regen(and Health/Mana Shrines randomly generated along with the floors) to scrape on through; however, the amount of Pots(Health or Mana) one can hold at one time would be unlimited for this mode, you'd get a chance to buy items before entering the first floor(of course), and every few floors you'd run into a Merchant, from whom you can buy as normal. You'd also have a random chance of running into a Merchant in between those "guaranteed" floors.

Lastly and optionally, you could maybe gain MORE IP from finishing a dungeon run quickly instead of gaining more IP from the "match" taking over 30 minutes; you'd definitely obtain more IP from finishing a dungeon run on higher difficulties, though.

That's about all I can think of... On a scale of 1-to-10, how bad is this idea?