It's more than the 5 man ganks clown fiesta, it's also the support meta change. Before it was Tank supports being dominant picks because they set up, peel, were defensive, more cc oriented, and protect the ADC. Now the only supports that work are poke, offense, and/or sustain supports. This was done due to the huge damage creep we have now. The best CC is having your lane opponents dead now. So now bot lane is determined by which damaging support fires off first. The damage is so high that Tank supports are becoming more obsolete with each and every damage increasing patch. Supports are ditching the defense tree and go for Thunderlord's Decree for more lane damage dominance.
The only good bot lane Tank support right now is
because she gets into the squishy supports face, stuns them, and then takes advantage of the damage creep by amplifying her Marksman's damage with her passive. This was increased even more so after her buffs. Sadly as a Tank support, I've only learnt this after being demoted from Plat 5 because took a break from clown fiesta league. Owell now I have a reason to try to play with passion again and climb.