This is just my opinion, but if the SCS organizers intend to implement 2-stage blind pick, I think it is fine to have it on by default. However, if one team doesn't want to do it, we go back to normal lobby rules.
MightyKeb has brought up a good point that teams shouldn't be forced out of their comfort zone. I think in the end SCS should also be fun and fair for teams who practice one or two builds/styles strongly.
Today's matches were pretty fun to watch, a lot of action and variety.