(1) It is absolutely Ossur to talk in Shul. (2) Rav Wosner may say what he wants as Posek Hador – in Shomayim they listen to him – so should we. (3) Every “kabola” a person takes on himself brings good to that person – even if we do not necessarily see it.
I would add that the Gerrer Rebbe, the Bais Yisroel zt”l, said publicly right before the begining of the 1967 war – that “Hashem yilochem lochem v’atem tacharishun” means that Hashem will fight your battles if only you would not talk during davening.
Another interesting point to consider (not negating not talking in Shul) is that the Pnei Menachem of Ger zt”l said that the “machla” is caused by people not “fargining” others. It is similar to the “machla” in which the white cells “eat up” the red cells. Just additional food for thought. Let’s “fargin” other Yidden. The z’chus of “ayin tova” is enormous.
Besurois toivos and refuous for all cholei Yisroel.