Agreed, that would be a wise thing to do. The introduction of UPX without accompanying GO service boosts may leave Kitchener line passengers a bit angry, but if they know "my increased service is coming on this date", it's much easier to swallow than "my increased service will be coming eventually". For what it's worth, I would think the Tuesday after Labour Day would be a logical time to start the increased service: summer vacation is over for students, and most people are back at work. It's also the time that many new students are forming commuting habits.