To take advantage of travel credits, people will have to take a new trip, but it's important to remember that in some cases, as Mr. Lawford mentioned, the opportunity for the trip won't arise again in the future. People may travel on special or specific occasions that won't exist anymore once the pandemic is over. We still don't know when it will be safe for people to travel. It may take another year or two. Even if vaccines are coming to Canada, we don't know for sure how they will be distributed. We know even less how it will be distributed in countries where people want to travel.
The other problem is that travel credits don't guarantee prices. It's possible that, later on, the travel credits may not be enough to make the trip that was originally planned. Airlines may charge people extra if they want to take the same trip.
Also, as I mentioned, many people experienced significant financial losses during the pandemic and struggled to make ends meet. Some people have experienced drops in income. Not everyone had access to the various government assistance measures because they weren't eligible. In this context, it is very likely that a large number of travellers won't be able to afford to travel in the near future.