It's still equally likely to confound a certain group of customers too: those who travel at the weekend!
Yes, but weekends at least afford the possibility of diversions via the Chiltern main line. Diverting that way on a weekday is essentially impossible without taking an axe to Chiltern's timetable; at least on weekends it's a bit thinner and diversions can probably happen even on Saturdays (Sundays are no problem). So from my point of view living in Coventry, I'd rather have a few extra weekends of diverted (but direct) trains to London, than two weeks of no trains to London without changing at Leamington or Reading - and even then all the trains would be much shorter than a Pendolino, with little chance of significant strengthening.
For commuters from Hemel/MK/Northampton etc. (or at least the vast majority who work on weekdays), this means no significant disruption to their commuting, except perhaps between Christmas and New Year (I'm betting that if the August block doesn't happen, the 25th-29th Dec 2014 block will get a bit longer to compensate). Sure, it will mean disruption for a longer period of time; all I'm saying is that's not necessarily worse than shorter (but more intense) disruption.