don't forget that they Balance things on a Team level and are trying to bring team wide strategic diversity. And with all honesty, the Tank meta isn't directly countering the Assassin meta. So I don't think Assassin will just go away or reappear because of tanks. And Tanks arn't going anywhere, even if Sej and Gragas get's their nerfs. Cinderhulk brought tanks as a whole back into the Jungle. When we have this Diversity, we won't really have a meta, telling us what champs are viable.
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I wouldn't mind a balanced meta. It should be that tanks can kill assassins and assassins kill ADC's and ADC's Kill tanks.
Rock-Paper-scissors isn't a balanced meta. not when riot balances counters as 60-40 win rate. (their are no hard counters) it doesn't even take every class into account, (siege mage, Bruiser, etc) And does not factor a champs/teams, power spikes. It's simply impossible to boil it down to Rock-Paper-Scissors.