I don't think having a bunch of competing currencies will be a big hassle. People will hedge their bets spread out over multiple currencies - and if one can develop the support to get accepted worldwide the others will be just as easily.
It's like when you walk up to a checkout line they accept Visa And Mastercard (as well as Check, Cash, etc.)
Right, I use ltc for hedging. When btc skyrocketed and I saw that the correction was imminent, just converted most of them to ltc. Statistical arbitrage - almost guaranteed profit.