CPW and O2 will soon realise that the hype and interested surrounding the Pre 3 and Touchpad are down to the firesale prices they were being offered at.
People are not going to risk top dollar for products that are, effectively, End Of Life and have no long term future.
You'd be shocked at some of the prices on ebay - people ARE effectively paying full price - as in PRE-FIRESALE full price!
I don't know if it's a matter of people being stupid and panicking cause they've realized it's their last chance to buy it, or simply because the firesale brought publicity to a phone that wasn't on anyone's radar before simply because the idiot providers refused to carry it, but either way it's selling out, and with the now-massive userbase it's sure to find support in homebrew apps and firmware even if HP completely abandon it.
EOL doesn't really mean much for phones anyway: with mobile processing power advancing as quickly as it is, there's only a limited time during which you can hope that OS updates will be useful to you anyway - look at how iOS4 made 3GSs crawl, or how Gingerbread is probably the last update 1-year-old Android phones that launched with Froyo on them are likely to get. If the OS as it shipped is capable and bug free, you won't miss out on much if you don't get further updates, and lack of manufacturer support doesn't mean lack of developer support either - hell, there's still apps being developed for WM6.x!!
(Not that I'm saying I'd pay £300ish for a Pre3 - not since I own a DZ already, just saying that I do think it's not as stupidly exaggerated a price as it seems to us who were expecting it to get cut down to £50)
HTC Universal > Desire Z > Pre3
There, I fixed it for you

The bigger the keys, the better the phone, and if my Uni weren't as fat as 3 Desire Zs stacked together I'd still be using it!

Seriously though, I still think it's a damned interesting phone, the Pre, both for the form factor (I find it very hard to use the DZ one-handed, if I'm walking down the street) but mostly for the OS.