wait you are actually considering this? what would you do, just sell them automatically for the highest buys on the exchanges? Ok i could see some interest all though it is hardly the optimal way to trade these things. Or would you hold a huge pile of btc and just exchange everyones coins for the last price on the market?
I see some problems with it just in terms of logistics. Exchange fees being a big one. And then the fact that... that's a lot of transactions. Unless they're pooled ... but doing an exchange sale only once every 24 hours is pretty sub-optimal especially with a volatile currency on each end. Doing them every block would probably garner the same concern from a different group.
On top of that, Joules, you are absolutely right that it could easily end up serving to kill the alternate currencies. Automated selling of a massive amount of available supply right as its generated... is going to kill the point, because the values will drop and it will be most profitable to mine Bitcoin to have Bitcoin.
Obviously miners (and that includes me!) are going to worry about whether we're profitable. But there really is such a thing about taking the biggest bazooka you can find, pointing it at your foot, pulling the trigger... and blowing your balls clear into orbit because your attempt to maximize profit was just that short-sighted and ill-conceived.