For starters, I can't ever see them serving refreshments.
The rest, while plausible, is doubtful, at least in the foreseeable future. It creates problems possibly for shut-ins or the infirmed, though I'd imagine that the elders would take circumstances into consideration. It also creates problems for the emotionally or mentally ill. For example, in one congregation I was in there was an elder's wife who hardly ever came - and once when she did, she had to leave very soon after the meeting began. Certainly they wouldn't consider such a person DA'd.
However, if those little problems could be side-stepped, it may be something that could one day happen. After all, they've already gone from not bothering inactives to suddenly being quite worried about them. And they DF smokers after a six-month window. So the six-month chance at reprieve plus a concern about inactives could perhaps one day morph into some new little WTS monster.