First of all I don't believe this rumour.
Secondly even if the Witnesses tried to do something like this it would fail. People would make excuses ("Yeah sure I am still a Witness, I am going to start going again next week..." never hear from them again until the next time the elders decide to pay a visit; "I really wish I could still go to the meetings but I have this debilitating illness..." what are they going to ask for a doctor's signature or something? "Oh that's a shame we missed meetings recently but we are actually planning on moving to another town really soon..." and so on. The excuses are endless).
Plus many families do not even shun disfellowshipped relatives as it is. Even if the Watchtower said to totally shun inactive Witnesses many people would ignore it. It would be a ridiculous rule and there would be a significant number who would see it that way.
It might give certain elders the ability to abuse their position by pursuing grudges with inactive people by having them excluded just on the basis they don't like them and they aren't at the meetings any more. I can imagine a few "zealous" elders who would enjoy doing that. But most elders could not be bothered I reckon, or would not have the appetite for causing so much trouble.
And can you imagine how depressing the meetings would be if every few weeks they had to announce this or that inactive person was now persona non grata? It would drag the mood down and be self-defeating. And it would also underline just how high the turnover of membership really is too, something they don't tend to dwell on so much as it is.
So I don't believe this is going to happen, and I don't think faders would need to worry about it even if it were to happen because it is basically unworkable and you could find a loophole.