I really hope this happens. The first three are great movies, even if the second suffers from some weak spots.
Willis is only 50 years old. If Spielberg and Lucas are planning to suit up a mid-60s Harrison Ford as Indy one more time, I don't think Willis is even close to too old to play John McClane again.
Everything about this movie feels like flop. From the director the to writer to the concept to the title. It almost seems like they're making a bad movie so the demand for a fifth one will be non - existant.
Jonathan Hensleigh should write and direct this movie. On the commentary track for Die Hard With a Vengeance he talks about having a concept for a fourth movie.