Something people can do on their own two feet, without a guide. People that want to do a tour of an area on foot don't need a museum to take them on one, that is silliness. People go to a museum to go a museum and see exhibits, and that isn't going to change because of new technology. Museums are the places go to view a Timex watch in a digital age, that's the point of having museums.
If people want to walk around from site to site, they can do that, it's cheaper than a bus tour or carriage tour, which is why a lot of people go on a walking tour of somewhere. It's never been anything a museum should have to feel responsible for, people can look at exhibits and pictures while they're in a museum, and they can see what's still there on their own time, the way they always have done things. As with friends, you don't abandon the old to make way for the new because someone tries to push or force change on you, since a new friend that expects you to abandon all your old friends and change was never really your friend.