Actually, people who resell games, books, cars, etc. Do negatively affect those respective industries, but it's not like that's something that can be avoided. Companies that are still around, however, have learned to adapt. For example, college textbook publishers are constantly releasing newer versions of the same textbooks (with revisions/layout changes here and there to justify it). This forces students to buy new books regardless of how many of the old version are still saturating the market. For the automotive industry, they come out with new models every year that generally have improvements over prior-year models.
With videogames, it used to be that they simply raised the new purchase price. I remember (not too long ago) when the major title games went from $49.99 new to $59.99 new. That's because they only see revenue from the first sale, and the previous price wasn't enough to justify the cost of making the game in the first place. This is a good idea because not only do they still see all the revenue from the initial sale, but they also get another piece of that in subsequent re-sells.
The only problem I can see with this is if people start just buying the $15 license and use them on pirated installs...