On December 10, 2020, Toronto mayor John Tory stated that Line 3 would fail and be taken out of service before the Scarborough Subway Extension was completed, with the failure possibly happening several years before completion. At that point, the Line 3 vehicles were 35 years old, well past their 25-year life expectancy, and had become unreliable and difficult to maintain, leading to reduced service and frequent service interruptions. The TTC was looking into an alternative solution of replacing Line 3 with bus service but refused to answer questions after the mayor's announcement, referring instead to a report expected in February 2021.