For decades the US has managed to be the most powerful economy in the world while taking in tons of these immigrants. Rejecting them is likely to have a negative impact. Xenophobia comes at a cost.
Now, for those same decades was the US also using gas powered cars and coal fired plants? Sounds like we need to continue using those too!
Also, wait till you see how badly the Canadian economy is poised to collapse: https://www.universityworldnews.com/post-mobile.php?story=20...
The only downside we've discovered for having an accepting immigration policy is xenophobic backlash.
I don't know what point you're trying to make with that article. Less immigrants is causing hardship for their higher-ed system. How does that make your point?