Not sure if you have actually used the internet over the last 20 years, but usually when an idea comes along and it gets a decent following it isn't just copied, it's copied a LOT. It is inevitable that something Bitcoin inspired is going to come along.
Bitcoin is actually a pretty simple concept (although you don't appear to get it). Its value is mostly not in the implementation of the idea but the community and the infrastructure surrounding it. A new entrant can't just one day decide to unveil a shiny new decentralized currency.
And what magical advantage would this new currency have that BTC does not? To my knowledge, there exists no problems with the BTC protocol itself. What flaw will this new currency fix? Bitcoin works beautifully, it just needs more services and convenience built up around it, but this is happening as we speak and a new currency would suffer the same burden.