While my initial reaction to the news that the Spider-Man franchise would be rebooted was mostly negative, there are some legitimate arguments in Sony’s favor. A younger cast is much cheaper, and they can also be more prolific. The second Twilight film came out within an year of the first, and it looks like Warner Brothers will be able to distribute eight Harry Potter films within a decade. With an adult cast, you’re lucky to have a new film every three years. See the gap between Spider-Man 2 and Spider-Man 3, along with the Nolan Batman films, Daniel Craig James Bond or the Bourne saga.
I doubt the next Director wants to be accused of following in the footsteps of Invincible, Nova or Blue Beetle, when this was Spider-Man’s territory first. So even though a twenty-something actor (Joseph Gordon Levitt has been mentioned a lot) could be a good twenty-something Peter Parker, continuing the story with a new cast just delays the inevitable.