Concept for new ARAM

Hello all i have a idea for new aram system lest go. Riot always says that they can't make ranked in aram because there is too much random things but hey why you can't do it better [zombie-brand-facepalm] something like this... People before enter to aram they could choose a champion class like assassin , marksman , mage , support and fighter and hay its 5 people so*[slayer-pantheon-thumbs]* it can be like when u play in sr with lane it can be system like we see in summoner rift so why don't do this?[zombie-brand-mindblown] I play a lot in Aram and all time i have ppl who don't wanna play some class and they left from lobby sometime they go afk i think it can work really good and imo it can work for aram rankeds too.