I was just wondering, if a RSE has never been entirely successful, why do companies insist on doing them? It's easy to come up with many examples of RSE's that were not popular, but hard to come up with ones which were popular.
You just pointed out two very seperate distinctions here, that I think points us in the right direction. There is a difference between realm-shattering events that aren't
successful versus realm-shattering events that aren't
popular.
Popularity in large part can be determined by the amount of complaints you notice on message boards like these, and emails the company receives. However, more than likely, many of the people who do this complaining did in fact purchase the setting in the first place. They bought the books, they read the books, they may have even played with the books... and it is what allowed them to determine that they didn't like what occured. But the bigger issue is... WotC
still sold the books. So in that regard, the new book was successful in what it was meant to do... get bought and bring in money.
The fact is... people who want to play 4E and want to play in the Forgotten Realms (to choose a setting as an example), will still most likely purchase the two campaign books even if the 100 year jump leaves them cold. The Player's Guide, because it gives all the new rules for the new races, the swordmage, all the Realms-specific paragon and epic classes etc. And the Campaign Guide, because there's just too much other useful information in it, compared with a DM having to do ALL the updating of the 3E book to 4E himself. Sure, a DM
could do that (and there probably are a few that do)... but in truth, that is really much more work that most players would want to do. Far easier to just drop the $30 bucks for the book, take from it what he needs, and gripe about the stuff he doesn't like. And in that regard, the book ends up being successful from WotC's point of view. Maybe not
popular, but successful.