The only place I think altcoins has a future in is gambling, normal gambling but first and foremost e-betting.I can not see how it will take over from normal currency's in the world of buying or selling any other goods then btc. The main reason I think this is that nobody wants to be that guy that bought two pizzas for 10000 btc 5 years from now, so i cant really see what else it has a real future in. But that is only my opinion, What do you guys think?
Altcoins are good alternatives for e-commerce too. Some altcoins such as XRP are good coin for instant transactions. It processed faster than Bitcoin and charges lower fee. The main reason why people would prefer Bitcoin still is because of its integrity, security, and volume of its holders/traders.
I agree to you, altcoins are also using in e-commerce nowadays. Not only bitcoin are been accepted by many merchants, there are also altcoins that are now can be use as mode of payment like litecoin and bitcoin cash.