The point on Selective Availability is an interesting one. It's supposed to be a non-issue, given the amount of commerical ventures, that routinely use (require?) it day to day. But since the system is owned/operated by DoD, I imagine that's why the Europeans are putting up their own system?
But it seems to me that when WAAS becomes more widely available, the issue goes away. As I recall, WAAS functions more or less like Differential GPS, which would reduce the error the S/A puts into the signal.