An abridged version would be a couple of gigabytes perhaps which isn't beyond the realm of possibility. That'd fit nicely on a smart phone/tablet and could be taken somewhere with less than adequate data connections (read most places on this planet).
With filtering I was thinking about discarding everything with less then 10 views. I consider all of your examples relevant. Getting rid of pages like "Wikipeida_suxxxs" is the first step.
For a while I had a 300MB text-only Wikipedia on my (Symbian) phone. Found most of the stuff I looked up. For example, I remember browsing some cocktail recipes.
An abridged version would be a couple of gigabytes perhaps which isn't beyond the realm of possibility. That'd fit nicely on a smart phone/tablet and could be taken somewhere with less than adequate data connections (read most places on this planet).