In 2014/15 we had fnatic, LDLC/EnVyUs, dignitas/TSM, VP, NiP and Na'Vi as tier 1 teams. Lets take a look what happened to them in 2016 where "the most competitive era" started.
fnatic won EVERYTHING until olofmeister got injured prior to MLG Colombus 2016. After taking a break olofmeister and the teamwork which made them so great wasnt the same again which also increased the inter problems in that team.
LDLC/EnVyUs like every good french roster had internal problems.
dignitas/TSM, then Astralis, didnt trust their IGL and took a stupid decision when kicking cajunb and not karrigan.
Virtus.pro was still good in 2016.
Natus Vincere also got fucked pretty hard by an injury and then when they decided to change their roster got even more fucked by the coaching update.
NiP just became worse in general because they have friberg and Xizt/THREAT got countered to fast.
If you take a look at against which teams they lost during 2016 then you would see that its strange as fuck that out all of a sudden (former) tier 1 teams are now losing against much worse teams.
Also the reason why we had that era of different tournament winners is that literally every top team had problems and were about to change their roster. We will see that in the future fnatic, G2, VP, SK, North, FaZe, NaVi and Astralis will be good consistently and on the top while the other teams will be in the top 20 only.