As we discussed earlier (thanks
@Urban Sky for the link) VIA 84 had to be moved later because with the decreasing track quality the travel time from London to Kitchener has now grown considerably longer than it was when the schedule was written. Prior to the schedule change on 15 November, it was physically impossible for the train to arrive in Kitchener less than about 20 minutes late, and the train was commonly more than 30 minutes late, causing it to block the first westbound GO train at Georgetown.
VIA tried a quick fix about a year ago by cutting the dwell time in London to allow the train to depart there earlier (thereby breaking the timed connection with VIA 70), but that was nowhere near enough. With the other constraints at London and at Georgetown, the train simply doesn't fit into that time slot anymore now, that it takes 2h12 to get from Kitchener to London.
If Stratford wants the old schedule back, they need to campaign for the track quality to be brought at least back to the level it was a few years ago when the old schedule was written. Whining to VIA will not do anything because the old schedule is physically impossible to achieve now. And it has been for a year, so surely Sharon McDonald, a "semi-regular rider" would have noticed that over the past year there was literally a 0% on-time performance with the old schedule, but with the new schedules trains are often on-time?