Something to aspire to, that everyone can be a tourist more than very, very rarely in their lives? IDK, maybe. But remember that most in the US will pick Vegas or a Mexican all-inclusive beach resort or something like that over anything especially horizon-expanding, and people in the rest of the world probably aren't much different so far as that goes. So unless you're picking the destinations, I wouldn't count on most of a large increase in tourism-related travel to be especially ignorance-diminishing.
No individual died from lack of tourism. One neither eats nor breathes tourism.
Yes, it was a large part of the world economy, so it is, or was, necessary to the status quo, and the status quo maintains many a lifestyle rich and poor, so it's specifically necessary to maintain the direction of the world as it was in late 2019.
But necessary like food, water, shelter, and healthcare? No, tourism is not necessary. Tourism is inaccessible to a percentage of the world populace, therefore it's not necessary.
Will governments define "necessary" after this? What mesh of dependence upon keeping their citizens alive will be determined? Will it even be considered in the rush to re-open?
Teaching them to read again will be more fruitful than flying them around the globe if less ignorance is the goal.
0. Tourism isn't a cure for ignorance, but it helps in widening worldview and experiencing how other people live and see. However, today it is mostly about having some time away from your residence/work.
1. Tourists are a small though non-negligible part of humanity as a whole
2. A large part of the people who have traveled as tourists have traveled to tourist spots, places that are developed to cater to the _tourists_ and hence aren't an authentic representation of the local population.
I do agree with your second sentence.
I've also lived in Spain and am constantly surprised how ignorant most people are about the country despite having been to far more 'tourist' hot-spots than I have?