Well, I think the OGL that opened up the D20 system for other designers to fiddle around in did a world of good. Not only did we get the really nice 3Ed/3.5 system (and other WotC products), we got:
Pathfinder
True20
Fantasy Craft
Midnight
Spycraft
Mutants & Masterminds/Warriors & Warlocks
Arcana Unearthed/Arcana Evolved
Second World
And many other quality games, I'm sure.
Each has its unique spin on the system, which will, in turn, create other innovations as each company takes their game in their own direction.
IOW, there won't be one evolution, there will be many.
As for issues?
My main ones are:
1) Designers getting too cute with their language. I'm an attorney who sees this at the professional level: the more convoluted your language, the more likely it is that either you or your intended audience will make mistakes.
In 3.X, that led to a LOT of those RAW vs. spirit debates.
2) A lack of controls on game design that led to some seriously flawed or overpowered spells, feats, powers, base classes and PrCls. Sometimes it seemed as if the people who brought us new stuff were not familiar with the old stuff.
Pathfinder
True20
Fantasy Craft
Midnight
Spycraft
Mutants & Masterminds/Warriors & Warlocks
Arcana Unearthed/Arcana Evolved
Second World
And many other quality games, I'm sure.
Each has its unique spin on the system, which will, in turn, create other innovations as each company takes their game in their own direction.
IOW, there won't be one evolution, there will be many.
As for issues?
My main ones are:
1) Designers getting too cute with their language. I'm an attorney who sees this at the professional level: the more convoluted your language, the more likely it is that either you or your intended audience will make mistakes.
In 3.X, that led to a LOT of those RAW vs. spirit debates.
2) A lack of controls on game design that led to some seriously flawed or overpowered spells, feats, powers, base classes and PrCls. Sometimes it seemed as if the people who brought us new stuff were not familiar with the old stuff.