Discussion on the future of eBook readers

Hi all.

I'm just curious to know what people think of the new wave of e-readers coming out? There seems to be a new one everyday, with some new bell or whistle.
I own a prs-505 myself. I'm very happy with it due mainly to the fact that it does what I want it to do - I can read books on it - nothing fancy about that! I will probably wait for quite a while before buying a new reader as I think the whole e-reader craze will die down.
What does everyone think? Should I plump for a new reader soon or wait it out? Will a particular device(s) come to dominate the market?Does technology mean that devices will quickly become obsolete?
I'd be interested to know what everyone thinks.

Thanks for your advice in advance