Not entirely true Steve, although we're sort of arguing over semantics over "cause" of the flex. The wing flex immediately ceases because of a rapid loss of lift on the wing. You are correct that that is largely because of the change in AOA on the wing as the nose comes down at touchdown, but the spoilers are also dramatically spoiling the lift, as is (to a much lesser extent) the decreasing airspeed, etc. Bottom line, a BUNCH of different things happen right at touchdown, all of which contribute to the wing lift decreasing.
As for your comment about the spoilers only being inboard. True, but the ENTIRE wing is deflecting. Not JUST the wingtip. Spoiling the lift inboard is still contributing to the lowering of the wingtip. Just like if you stick your arm straight out and pivot your arm only at your shoulder. Your fingertips still raise and lower too, even if you don't move your wrist at all.
UAL has never, ever, taken responsibility for their own bad business decisions. They constantly have someone else to blame for any unprofitability, service cut, furloughs, etc... They just found a scapegoat in Southwest this time. The real travesty is that this is EXACTLY what happens every time two airlines "merge". The airline trumps up public/government support for the merger by boasting the "increased service" that the merger will bring, but shortly thereafter the incorporated airline (in this case Continental) starts getting its old hub gutted. Just look at STL after American bought TWA, or MEM after Delta bought NWA, as two examples. Apparently, however, most people seem to drink the koolaid that the airline serves.
I don't know the details of this, but I HIGHLY doubt the aircraft was "forced down" or had to make an "emergency" landing. An aircraft that loses its GPS ability still flies just fine, only the precision of its navigation isn't as great (but is still as good as navigation was for the first 90+ years of aviation). Most likely, the aircraft cut its mission short, but I'm sure the landing was 100% routine. Melodramatic journalism trying to hype a non-story in order to attract readers.