A valid point that I've mentioned elsewhere several times before. In particular, frequent wholesale generic reassignments (and to a lesser extent grammatical tweaks and retrospective spelling corrections) are great fun for us taxonomy addicts, but the result is an absence of of commonality and stability in the scientific names used by different authorities and authors. Sadly, I have to agree with Morgan that, despite the sometimes unnecessarily trivial bickering, for ordinary birders common names often provide a rare strand of continuity amid the turmoil of increasingly ephemeral scientific binomials.
I suspect the rare strand of continuity provided by English names is not only of use to ordinary birders! Until there is a period of stability in generic assignments, how can anyone, for example checklist authors, ever hope to select the "correct" scientific name (ie the one which will endure). A Saunder's Gull will always be a Saunder's Gull but I wouldn't put a pound (Euro, dollar) on the name Chroicocephalus saundersi seeing out the decade..