I'll wager that one content patch from now will severely damage Eureka participation. Two and it will effectively be dead.

Why? Because most will have what they want. Any new content they add will undoubtedly favor higher levels and higher level players will not be interested in leveling low level players.

Unless they force more relic pieces/items into Eureka. Then it will be another boom of dissatisfied players complaining because they have to do it.