It's very possible in 5 years time there could even be a war within Bitcoin itself.  The problem with the 1MB size limit for example and how to deal with it.  As problems and solutions come up, I could see forks in Bitcoin as a possibility.  Some people go with Bitcoin-y for a certain reason while others go with Bitcoin-x for other reasons.

If that's the case then the early, pre-fork Bitcoins would be more valuable as they could be used on all chains.  An early adopter bonus, if you will.