Phelps was an alien. He was an artifact from another era.
No one goes as hard as those old hardcore dues from the 80s.
All the "hellride" stuff would have been corny if it wasn't 10000% sincere.
No one went for it 100% of the time, all the time like him. It was never turned off because he couldn't turn it off.
Kids listening to Black Flag and running from the cops and skating pools have given way to Reality TV, Nike SB, and the Olympics. It is what it is. That's the natural order of things. That's what happens. But Phelps was a creature from the old order.
Skateboarding will progress. But without Phelps, it will never be the same.