FPTP was fine when elections were held within a riding, and results were delivered by horseback. You were voting based on a local candidate, not the national party.

Then the railroad, telegraph, telephone, and internet were invented, politics became national, and we're still using FPTP.

I don't think the Liberal are willing to sacrifice their entire future as the one of the two alternating parties in order to gain a few more seats.

338 on a federal level projects them for 67 seats and 24% ± 3% on the popular vote. That translates to 85-91 seats which is a decent gain.

However this would mean the Liberal will likely never get anything close to majority again. I would also believe they would slowly dwindle in popularity with a rise of smaller parties. That's a lot give up for 24 more seats for 4 years.