I dont think bitcoin will kill off all other ALT coins. Imagine 5 or 10 years from now end users are selling their products online and accept multiple forms of payment BTC, ETH, LTE, etc. Why not??? Just look at this chart here.
http://coinmarketcap.com/charts/#btc-percentageThis is the total percentage of the market that Bitcoin dominates. And since the beginning you can see that the peaks are becoming less and less. So this means ALTs are taking up a bigger percentage of the total Crypto market cap.
I think BITCOIN will be a STRONG crypto. It will be the mother of all cryptos, people will buy it to branch into other ALTs if need be.
no need to wait 5 or 10 years from now, i think after halving yesterday, alt coin (almost every) got up trend in many market and there are some of altcoin jump into 100 % than before. and of course bitcoin will be mother of all cryptos, people exchange (selling) altcoin into bitcoin and the cycle will rinse and repeat so there are many altcoin will start to get up than before.