As others have stated: Yes, future trips to Europe, when they resume on a more normal schedule, will cost something.
Will it be more or less than what the previously posted prices for this year? Yes.
I am only predicting here, and I know how much some people dislike predictions, but it looks like there will be a window of low cost airfare hotels rental cars and cruises and other travel related items in the near term. The companies simply want some sort of income so they can pay their bills. If they fill a plane at cost, at least they are not losing money by flying an empty plane. Same for other businesses. So look for the $49 airfares on airlines that never had them before. Look for massive frequent customer bonuses (mile/points/upgrades/freebees). If you were already a higher level frequent customer, look for those companies to really kiss your ... well no kissing for the moment. But look for them to do whatever they can afford to insure you do return when you start traveling again.
But this will only be a short window. As more and more people are allowed to travel again, virus or no virus vaccine or not, things will begin filling up. People with bigger brains than I have have already written massive computer programs to predict how much people will be willing to pay for their services and those programs will be let loose on the reservation systems and prices will vary tremendously because of supply and demand. This will be mostly in the airline area because of all the planes that have been removed from service leaving a much smaller fixed level of availability. So until the airlines are sure the demand is there and is sustainable and they get their grounded planes back in service, the prices will spike. How quickly this happens will depend a lot on how "open" the world gets. Countries merely saying they are willing to allow some tourists from a limited area in is not going be enough to restore confidence in the travel industry.
Then there will be those who have always wanted to run an airline or a hotel or a car rental service or whatever will see a demand and jump in. This will be the return of the discount travelers. But this is not going to happen next year, or even the next couple years. It always happens, it will just be very rough and expensive until the next wave rolls in.
And even if a vaccine is approved tomorrow, it will be months before a significant population is vaccinated and we know it will do what it is supposed to. Simply manufacturing the vaccine at volume can take months. Distributing it will take time. And who decides who gets it first? Is it the front line workers exposed to it everyday who really need protection? Or will it be politicians and wealthier people who get it just because? Only time will tell.