You probably are also aware that anyone coming to Canada without a visa is still required to complete an eTA application or form. Approvals are very fast. Within 72 hours, I think, over 98% get approved.
If for a short period of time we get through the backlog.... As we mentioned, the backlog is over 70% temporary residents, so what would happen is that many individuals wanting to come to Canada would go through the eTA if the country is exempt.
You could have something like an enhanced eTA. For example, in a country where you should have an eTA, you add to it two pieces of information—one for security, such as a police certificate that is recent within, let's say, the last five or 10 days, and another document about financial capacity—to come for a short period of time to visit Canada. This is how we see it implemented on the ground.