If a new version of Bitcoin came out that removed the power that mining pools have (so that we never had to worry about one pool taking 50%) then I and probably most of the Bitcoin miners would immediately switch over to it. Fortunately for us, the only individuals willing to improve Bitcoin in such a fashion also already have a stake in Bitcoin, which means they will improve the current digital currency instead of create their own new currency.
Even if they did come up with a newer more decentralized currency that WAS NOT an extension of Bitcoin, the network would simply adapt exchange rates to provide an incentive for current Bitcoin miners to adopt a similar policy. IMHO, it's a win-win scenario.
They aren't joking when people say competition will make Bitcoin stronger. I welcome it!
Hell, I'd love to see the US gov't come up with a competing digital currency and say "backed by the US gov't". I might even mine at it.