For the people seeing red about the possibility of more immigrants (and I assume they assume these will be 'diversity' immigrants), you hold the solution. The fact is the population is aging and we're not 'repopulating' fast enough and economists (though I question their facts and ability for accurate projections) say this could this affect Canadian competitiveness, economy, and future prosperity. I believe Japan is having this problem right now, aging population, low birth rate, no one to take care of said population so they're building robots to do the job. 

Anyway back to the people seeing red, its really simple, given that white europeans don't seem particularly interested in immigrating in large numbers anymore, why not just start having more children?  And good luck with that btw because the main reason for Japan's falling population is the lack of employment opportunities for young people.  You will need to lobby your gov to put social and economic structures in place for this.