The way I read this suggestion, it means that all particles under a blocker wall tile are on a separate set of channels, but nothing changes for particles enclosed by blocker wall. Doing it only for particles under a wall tile makes it more practical than previous wifi blocker suggestions, since it's easier to identify which particles are affected, and only one copy of the wifi and portal channel data is needed. Blocking arcs from ETRD in the wall is also practical.
If someone does it and makes a pull request, then it might be accepted. Otherwise, it'll probably go on the extremely long list of suggestions that would most likely be decent if anyone ever gets round to implementing them, and stay there. A blocker wall might be interesting, but there are a lot of other interesting things which I'd rather work on. Plus I should be revising for exams...
Also, too much bumping D:
I read most threads, if I don't reply it's generally because I'm too busy, don't have a firm opinion on the idea yet and want to see further discussion first, or am not overly enthusiastic about it. Or sometimes because I quite like the idea, but don't want to give false hope that it will be implemented.
There is somewhere,there always is, there is always someone that can code a particular thing on the interwebs, Possibly under the Alias of Code norris.