Well, he did the exact opposite to Star Trek, then again both franchises have different vantage-points.
I wonder what he is going to do with Star Wars. Trek was a complete reboot and pretty much kicked the established lore in the ass (I personally think it was an entertaining popcorn movie, but the setting was hardly Star Trek, it really was quite interchangeable..). But the franchise was basically dead at that point and it didn't go peacefully with Nemesis as the last movie. But Star Wars? There's no need for a reboot - in my opinion at least, yet there's no obvious starting-point for a story to tell. True, the lat three movies weren't really critically acclaimed, but Star Wars is far from the shape Trek was in during Nemesis.
There are a lot of stories that could be turned to films, the whole extended universe thing and the comic book series, which feature a few rather gritty plots (beloved characters die, Luke turning to the dark side, etc...).
But Star Wars? There's no need for a reboot
That depends on what your definitions for success are. If you define it as making money and generating interest, then you are right, there is no need for a re-boot. If you define it as making good films that could stand the test of time, then I think they should take the boot and re it.