Any chance you can get this same page layout for the page that is to replace this one? I find it quite convenient especially the way the home page is presented.
As for the site I think we all saw this coming ever since that Twitch migration. People were reluctant to go forward with the change of things and then another change occurred and so forth. When you see a site getting kicked like a bucket from company to company it comes to no surprise that it is going to shut down (hence why I slowed down on being active with posting decks or interacting with other members).
Gadgetzan Auctioneer hasn't seen play in a some time. He saw some play in Malygos centered decks but even there he got quite slow especially after the druid nerfs to ramp tools.
Out of all the rest of the options you provided, I think only Malygos could warrant a HOF treatment but for the developers to not have moved him there I assume no low cost spells or ways to cheat out summoning him earlier are going to be printed.
I am honestly satisfied with the changes Blizzard is about to make. They are all on point and we should feel grateful for them. Maybe you haven't played a game where the developers were unable to determine the problematic cards and were nerfing/banning the wrong cards resulting in an utter mess. I sure as hell know of such a game and have quit playing it long time ago.