Champion Interractions

Since Yasuo came out a new thing was introduced to league - and that is skill interacting with one-another. Having other champions with knock-ups suddenly opened multiple avenues for one character to cast his ultimate, suddenly we had a scenario in league where a champion's kit was not only synergistic with his own, but others as well.

I know this topic was debated in the past (long, long ago actually) but wouldn't it be interesting to have the possibility for Anivia's E to synergize with the other Freljord champions? Or have a dedicated poison team that would make Cassiopeia an absolute terror in teamfights? Suddenly you'd have team comps that would come with a specific set of strengths that would make champions who do not see a lot of competitive limelight (Cass, Sejuani, Ashe) viable due to their interactions with other champions. These champions would individually be less powerful than more optimal picks (See; Kassadin, Lucian, Jinx, Lee Sin) but would open up the avenue for a more team-oriented playstyle.

I ask Riot, has this ever been considered? With Yasuo released, can we expect more champions that suit specific teamcomps rather than be a one-man/woman pubstomp? How would the inclusion of said interactions benefit the game, or work against it? I feel that in light of the surprisingly stale competitive scene in terms of champion picks, this would bring a new dimension of complexity to character selection and banning.

Feel free to share you opinions! :)