GMforPowergamers
Legend
If I am correct you are counting 3e, 3.5, and pathfinder all in there (correct me if I am wrong). That is three versions (based on the same chaise) for 14 years... at the very least you have to combine 1e and 2e (since they too were backwards compatible) to compare life spans... I believe that is 20 years...
Let's just clear something up real quick. 3.0 and 3.5 are not separate editions.
Basically you have 3rd edition with Pathfinder carrying the flag.
Also, look at all the games that have spawned from the d20 engine such as Star Wars, Elric of Melnibone, Cthuhlu, d20 modern etc... Don't remember too many games that were created from the 1 and 2nd edition models.
2e was more compatible with 1e than Pathfinder is with 3.0. Many spells are different, and the classes were all retooled for 3.5. You can say that PF and 3.5E are somewhat compatible, so that would give you a life of 10 years or so now?
Other than a few tweaks, adding NWPs and buffing up monsters, 2e was pretty much the same as 1e.
I didn't even call them editions in my original post...
If I am correct you are counting 3e, 3.5, and pathfinder all in there (correct me if I am wrong). That is three versions (based on the same chaise) for 14 years...