The mechanism is supply and construction cost, not a guaranteed discount: faster, cheaper-to-build homes can add inventory sooner, and the Saskatchewan REALTORS Association's benchmark already reflects how tight or loose that supply is running, currently sitting at a supply measure of 1.63 months.
Whether that translates into lower prices for buyers depends on how much of the savings a builder passes on versus keeps as margin, and on how many modular units actually get built here rather than discussed, since a small share of total construction cannot move a citywide number by itself.
Joel Dyck tracks what is actually selling and at what price in Saskatoon rather than what a construction method could theoretically do to costs. Get your hand-reviewed valuation from Joel Dyck.