Disable new champions from ranked games for the first week at least

We all see that new teaser on LoL site (new champion probably) and the only thing i can think about is that low elo players basicly who buy the champion and without even know the basic mechanics start ranked queues. As the title says i think its proper to disable new champions from ranked games for a while just to prevent games going into a disaster and giving some time to learn the champion. Everytime a new champion gets released the same story all over again. _**Edit**_: Now that Ekko is coming out and with mastery level being rolled out can we make it so that in order to play ranked games must be at least mastery lvl 3 or even lvl 5 it sounds better
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