I'll be the first to admit that PalmOS is getting (very) long in the tooth, but I'm still disappointed that Palm is really dragging their feet on releasing more Palm OS Treos. The Treo 755p was the last real business-oriented Palm OS Treo released. And the Centro was the last PalmOS Treo of any type released.
Palm is working on their new Linux-based OS platform, and while I'm sure they need to devote most of their engineering resources to it, it's taking so long that business Palm OS sales are going to be dead before long (if they aren't already). And then they won't have anybody to sell the Linux platform to.