For that election cycle, perhaps.
Until we know certainity of outcome, I see that A-Line could be either BRT or LRT+BRT.
Full length A-Line true-LRT is not economically viable at this time because you're sending trains over a section of nearly rural to the airport, and the airport is still not grown to enough passengers to warrant full LRT operation yet. I'd like to see that change quickly. But perhaps time will actually fix that for us. After a few election cycles of delays, then A-Line upgraded express buses followed by full-length LRT long after people have experience the B-Line LRT, really like it, and demand the A-Line be an LRT instead of BRT.
Some possible A-Line scenarios that happens, assuming B-Line proceeds:
(A) Election cycle 2022 leans A-Line LRT early.
RESULT: Funding gets approved to build an A-Line LRT Watefront-to-Limeridge right after B-Line finishes construction 2025. Upgraded bus connection from Limeridge to airport, with some downtown-to-airport nonstop bus service (such as a GO bus) introduced at least until full length A-Line LRT (as an A-Line extension later on).
(B) Electon cycle 2022 leans A-Line BRT
RESULT: Funding gets approved to build a B-Line LRT full length, with real Transitway facilities in the core section (where room) -- curbed lanes with Transitway-sized or near Transitway-sized stations (single lane stations though), with upgraded connections. Express bus lanes in the narrow sections, and shared automobile/bus in the James Street North downtown section (initially, until it turns into a transit mall by the ~2030s-2040s).
(C) Eelection 2022 and 2026 screw up further BRT/LRT funding for many years
RESULT: We hopefully limp along on an upgraded #20 A-Line Express that is gradually upgraded to 15 minute service AD2W. Automobile mentality continues to prevents curbed Transitway style BRT that's #BRTcreep-proof. The B-Line begins operating 2025-2026 (1-2 year delay), and then demand builds up for a full-length A-Line LRT that eventually gets funded by the end of 2030s for a build complete by 2041.
These are only theoretical examples. Many possible outcomes.