I'm reluctant to break up the 'dialogue', but here are a few numbers to inform the debate. There are, indeed four buses a day travelling from Duncan to Victoria in the morning, and back again in the afternoon. The Duncan Commuter route 66 leaves at 5.32am 5.55, 6.10 and 6.25. The return buses are more spread out, leaving at 3.45, 4.10, 4.45 and 5.15. The subsidized fare is $10 each way.
The route has run since 2008. Today it uses the Nova Bus LFS Suburban designed for longer commuter routes equipped with high-back seating for up to 49. It clearly carries more Duncan residents who have business in Victoria, rather than only commuters. The
2012 Transit Plan shows for the return journey the 3.45 bus saw an average of 41 passengers, the 4.15 27 passengers, the 4.45 25 passengers and the 5.15 just 12 passengers. That's a total of 105 passengers heading back to Duncan. The morning riders are apparently more evenly spread over the four buses.
The 2006 census showed 60 Duncan residents working in Victoria, 55 of them driving. 1,160 Duncan residents drove, and 30 took transit, (but none to Victoria). The 2016 census profile showed 45 Duncan residents traveling to work by transit and 1,170 driving.
So a few things I noted: the $10 fare attracted only just over 100 people taking the #66 buses (and even if it's more today, no more than 200). The buses leave Duncan early, but at least there are four times to chose from, and coming back from Victoria there's even greater flexibility. One train a day would seem to be a downgrade of the current options - miss the train; you're stuck, which would seem likely to attract fewer passengers, not more. (That's ignoring the significant capital costs needed to establish the service). The existing service could easily be improved, with an extra bus or two. The service would be ideal for the introduction of e-buses, which could travel the entire route out and back on one charge, and then recharge overnight.
There are other buses on the route; the 44 also travels between the two cities, but slightly slower. That has the same fare, and three buses a day at more convenient times (and on Saturday too).