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Sure, you always get some streaks at 50/50 chance, that's in the nature of random. Point is that what people has described here is a systematic cyclic behavior of loss-streaks and win-streaks. Especially loss-streaks but that may be headology.
Personally, I have experienced too many streaks relative to the number of drops I have made. It could still happen if I was particularly unlucky, but it's unlikely.It can place you at the wrong elo level for a long time, thats cool, which would make your team slightly worse (by you being 1/12 underperforming, right?). Point is, if this happens to only a few players the lucky one should experience better opposition but also better teammates.
If this does happen to the majority of the players all that does it making MM more random, which should result in more uneven games, but not affect the probability to win or loose.
Anyways, it had been nice to know more details about how the mm builds each game.
On a side note, I am enjoying a really nice win-streak at the moment.
From being down to 20 more wins than losses I am now up to 50 more wins than losses and I went that +30 in perhaps as little as 40-50 drops. I say something is not right but right now it feels great! 
