Where supports are heading.

So, With Soraka, taric, and Janna nerfed out of bot lane, Zilean a non factor as always, and new nerfs to Sona (played so often already), lulu, and Braum. Does anyone else get the feeling that Riot is telling us that the only acceptable support picks are thresh, morgana, and Leona? When I see a champion that is already widely considered unviable already like Sona being nerfed substantially, while Supports that are picked or banned in practically every game are being left alone, I can only assume that Riot is acting preemptively to enforce a specific meta, this case one useing thresh, leona, and morgana. What do you think?
If you agree that riot is acting to enforce a specific bot lane meta, do you think it is for supports only. Recent buffs to lucian combined with nerfs to his strongest counters appearing on the pve seems to imply that either riot wants to solidify lucians place in the current meta or force caitlyn (the only major counter to lucian not seeing an incoming nerf).

Also, if you agree what do you think in the future? Are the braum nerfs the same as the sona nerfs or is braum just being corrected for being to powerful but still accepted by riot as a champ that should be in the meta? Do you expect nami nerfs? As Nami is still viable, unlike Sona who is still getting nerfed despite being very weak already, and as Nami fills a similar role to Sona, do you expect we will see future nerfs for nami as riot continues to force sustain and poke champs out of the support role in favor of aggressive play makeing tank supports?