Thank you for the question.
Basically, to make it short, IRCC should give all of the spouses a special TRV. First of all, paragraph 179(b) should not even be considered. Yes, obviously they have ties to Canada, because the spouse is here, but why would an officer say that they feel that the spouse will never go back to their country? Why would a principal applicant ruin their chance of staying permanently in Canada by overstaying their visa? For me, it makes no logic.
To answer your question, they would help the economy, they would pay tax and they would be with their family. They would also see if they liked the country. Maybe they won't like it. Maybe the family will move out and go to the home country of the principal applicant.
Basically it would help, because right now we need labour. We have tons of jobs but nobody to fill them. These people are spouses and very hard-working people. I don't believe they would stay on the couch and watch TV, so it would definitely be beneficial for the spouse, the children, the families and this country as well.