Do the US even play tests or ODIs outside of the world cup and ICC champions trophy?
What's this got to do with anything? I sure hope it isn't an attempt to denigrate his opinion based on the fact the country he lives in isn't a Test-playing nation. For all we know, he could be an ex-pat Pakistani/Indian who just lives in the US (not uncommon and there are a couple on this board in fact).
Anyway, as a big fan of Katich yes I'd say he's been very unlucky but to just drop Symonds has more pontential naties than benefits. By continuing to select him for this series whilst they're still winning, the Aussies selectors are, in effect, saying "We know how good you are and that you're going through a bad patch; it's a matter of tine until you play a blinder and we're going to keep faith with you until then." Dropping him now when he appears as if he's about to break this run of outs might just set him back and it also sends the message to the rest of the team that as long as you're playing brilliant innings, you're okay but as soon as you have a few early outs, you're gone. No team performs well with the players under such pressure.
As far as I'm concerned, it SHOULD be MUCH tougher to get into the Aussie side than to get dropped. Why? Because once you're in, a team should be strong enough to carry any given player for a short period going through a bad patch like the Aussies are doing with Hayden and Symonds. Just because there are more in-from players around doesn't mean they instantly deserve a spot in the team. A team of champions does not guarantee a champion team and first and foremost SHOULD be the team in the selectors eyes (as it seems to be). Just picking a team on who's in form won't guarantee success (and has shown the opposite effect on many occasions in the past).
Now, if Symond's form continues until the end of the current series, it might be an option to look into a replacement. But now, I don't believe he deserves to be dropped. Katich is extremely unlucky but his time will come. He's too good a player for it to not come.