In the long run*, open sourcing is not optional. It's not about crypto-culture or political leanings. This is real money we're talking about, but without the force of courts or the peace of mind from insurance. If anyone wants to transact big amounts where anonymity is critical, they'll want something open source even if they themselves can't understand code.

* And I think the "long run" needs to be a lot shorter than some people are imagining. Think 10-20% of LTC market cap, not $100 per coin. At that point, DRK should be more or less un-catchable.