So do you think people would keep mining ixCoin just for some paltry fees? That's the biggest risk in my mind, people could just lose interest and totally forget about ixCoin as soon as there's no more coins to mine.
Is it possible for ixCoin to do a hard fork and say, add just a few hundred coins per month forever as a kind of inflation thing? Something to keep people mining.
Without actual commerce in ixcoin there won't be much in the way of fees so it's unlikely that the current large miners will continue mining. Enthusiasts will likely still mine so the coin will probably continue. One of the reasons for ixcoin, if I recall correctly, was to see what would happen when a coin stops having a subsidy to get an idea of what will happen with bitcoin.