Do you think the average person on the street knows the name of their constituency? Well perhaps they do if they live in the middle of a smallish city, such as Exeter, but that's out of common sense rather than political awareness.
If you asked someone in Manchester what the actual name of their constituency was I'd be surprised if a majority could get it right first time. The same with rural counties; do people realise there's a Devon Central, a Devon North, a Devon West, and a Devon East, and do they know where the boundaries actually are?
So the MPs that have come out today (the majority of whom would see their seat abolished under the new boundaries) saying that these boundary changes would "tear apart communities", don't really understand that the public don't work, and have never worked, on parliamentary constituency boundaries for the basis of how they live their lives!
Any synthetic anger at these proposals is either aimed at the government for the sake of it, or self interest because the MP might not be able to find a suitable seat to stand for at the next election. This is rapidly turning into a Westminster village story and I doubt very much the public will care about where a line is drawn on the map.
JR