Dare one suggest that other satellite navigation thingy that starts with 'G'?
Well, as I understand it the point of Galileo is that it complements GPS, providing political independence, greater accuracy and (most importantly for aviation) greater redundancy, when used together with GPS. It's not just a matter of a simple alternative.
It occurred to me that perhaps our own CAA are looking at Galileo, with dual receivers in nav equipment, to be an opportunity to finally phase out the legal requirements for "steam-powered" (NDB/VOR/DME) radio navaids to be carried. If this has been CAA's private expectation, then the failure of Galileo could be disappointing for all potential GA users.
However, if the only way to get Galileo operational is hefty subscriptions for all users (paying a premium for the improved service it provides over GPS), and the use of Galileo was mandated for IFR flight, this would be bad news...
But this is all idle speculation over decisions that we may be a decade away from.