Think what must be understood here is not the 'hard core' such as those that occupy forums like this and bleed sky blue but the 10% of the 300,000 or so general public with their families and friends who go every week or most other weeks at home games from around the city of Coventry.
That is who are affected the most. In other words the 'main' body of support that any football club needs. Most of those will not venture to Northampton but for a couple of times. Only the ones who bleed sky blue will go, a bit like away fans if you like. Take those and add a couple of thousand at best of those missing 10% of normal fans and that will be it.