Theoretically, such a cryptocurrency, or altcoin, which would be better than bitcoin, may well appear. And in terms of functionality, let's say such it's blockchain will solve the bottlenecks of bitcoin blockchain. Such new altcoin would be more interesting for investors for many reasons. I'm not saying that it must be in future, but it rather possible.
And such altcoin could control market.
On usability maybe there's some altcoins that better than bitcoin but if you're talking about price then I guess it's almost impossible to beat bitcoin. I've seen many altcoins with awesome function lately that bitcoin doesnt have.