Reasoning behind the ranked 5's removal please!?

I would like to bring a point that has really been bothering me and my friends recently. So we have all been playing league of legends for a couple years now and would look foward to being able to hop onto a game of ranked 5v5 and take our team to the best rank it could reach, however now with the dynamic queue addition they have removed this feature and none of us wish to affect our own personal rank by playing as a 5man as we wish to achieve seperately as well as a team group. I would just like some clarification as to why with the addition of dynamic queue to encourage people to play together did they remove the one aspect of the game (ranked 5's) that encouraged team play to make it to the top. Feedback welcomed.
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