Decades from now, the situation will be different, and we'll be able to look back with more perspective. One reason books and paintings survive over time is because of their formats. In Michelangelo's day, someone could walk into the Sistine Chapel and admire his magnificent frescoes, and you can still walk in and enjoy them today. Since physical books are basically the same as they were a few centuries ago, copies of Milton's Paradise Lost still abound. The poem is just printed again and again in a familiar and accessible format.
Games are a different matter.
They're intimately tied to technology's lightning advance. Just trying to get some DOS games from the early 90's to run under Windows 98 can be a chore. About the only way to judge these early games firsthand is by shelling out a pile of money for an eBay auction or taking advantage of the emulator scene . Games and hardware move hand in hand. When many new games look like glorified tech demos and graphics are their most marketed feature, the trend doesn't look likely to change.