Not lifting travel restrictions is not realistic unless you are talking about North Korea. If you do not lift restrictions you are also punishing your own citizens (if you let your own citizens travel they can bring back the gift that keeps giving). We will see. And quarantine where? In many countries for returning citizens it just means "please go home and try to avoid contacts for 2 weeks", which is not super effective and gets treated creatively a lot.

I see friends (US and 2 countries in Europe) who are not affected by job losses booking vacations like crazy to take advantage of low prices to visit places they always wanted. So I suspect there will be a lot of travel again in the near future.