Yeah I don't really disagree with you that much; I just thought you were phrasing what was at heart a good argument poorly and it annoyed me.
Where I do disagree is in the implication that Australia have had a procession of budding Gilchrists ready to take over from Paine if only he wasn't captain. When Paine was picked originally (not as captain at all, keep in mind), Paine's actual output so far (ignoring captaincy) was pretty much exactly what the selectors were rightly looking for. "Average over 30, keep very well and don't let top order batsmen get stranded very often" was absolutely a good result from the bunch of keepers that existed domestically at the time. Carey has improved a bit since then but was averaging less than Paine does in Tests in FC cricket at the time and the rest of the keepers in domestic cricket were a mix of batsmen pretending, kids, and players whose records (either at Test or recent domestic level) absolutely indicated they would've done worse with the bat.
It's slightly different now that Carey has started scoring some FC runs, and showed an aptitude for international cricket in ODIs, but this is a pretty new thing.