Not really. If you scale up a game's ambitions and also the team, then you've got similar levels of responsibility for each member compared to a less ambitious game with a proportionally smaller team.You will probably learn loads more than in a less expansive project though...
It's also a hard claim to make before we actually see what SC's devs can ultimately accomplish in a finished release, and it also doesn't take into account the huge amount of time it took the devs to do it. Even most large scale AAA games only take like 4-5 years to make nowadays. Not 10+.
But really, devs generally tend to learn more by having a strong vision and specific goals where they can work at what they need to, not just endless scope creep where their priorities are being yanked around and the idea of how the systems they're working on will work on the many, many other systems that are only still being worked on and could be changed. Star Citizen will almost undoubtedly face massive problems trying to put all these systems together in a logical, balanced, bug-free and enjoyable way.