Air Canada's enthousiam for the 737MAX might have changed after the string of quality related disclosures on the MAX since march 2019.
The statement about the MAX in AC's quarterly update was very terse. No mention of continued commitment to the MAX, just that the return-to-service is "uncertain". Reading between the lines, I think it means that AC's patience has limits and that they may be fast approaching. Les Ailes du Québec earlier this year reported that if there was no RTS by June, AC would have to seek an alternate plan as its backup plan (extending leases, buying capacity elsewhere, keeping older aircraft) was only good until the end of the year. By then some of the back-up capacity would be ready for major overhauls, or have run out of cycles. Then the pandemic hit.
Of course the pandemic gives some breathing room. The older aircraft are on the ground, not accumulating hours or cycles, so if flying starts to pick up again at the end of the year, the contingency plan could theoretically be extended another 6 months in normal conditions, or a full year or more in a depressed market. Right now cash is king at AC, they can afford to sit on their hands and see how things shake down.
I myself am skeptical of the MAX RTS, and equally skeptical of AC sticking with it in the long run. If I were AC I'd go forward with the A220 deliveries (a modern aircraft in every way), and at best defer the undelivered MAXs indefinitely. Everyone else is deferring orders. But then again, I may be wrong. My ex-wife happily keeps pointing this out to me...