I think you can be a marginally better mousetrap if the ones that already exist aren't quite "good enough". If there's a need for a better one, and you fill that need, there might be success if you play your cards right.
In an arena without a need for a better mousetrap though you are going up against already established competition, because they are already "good enough". People rarely go looking for better when they have good enough. :)
Yes, I think you're right on that distinction, and I guess I sort of internalized that. As Seth discusses to in the linked article, things don't become "iconic" without at least being "good enough" in that category - so if you're saying you're the "next" something, they're probably at least good enough.
1. Programming
2. Playing computer games
3. Bowling
4. Playing Piano
5. French!
6. Cycling
7. Travel
8. Exercise
9. Watching Movies - they have to be good though
In an arena without a need for a better mousetrap though you are going up against already established competition, because they are already "good enough". People rarely go looking for better when they have good enough. :)