Valve Plans For More Half-Life Beyond Episode 3
Ars Technica notes, via an interview at the StuffWeLike site, comments from Valve's Doug Lombardi indicating that the company has plans to continue the Half-Life series beyond Half-Life 2 Episode 3 . "While most sites are taking this as a confirmation of Half-Life 3, the quote is not a definitive on anything other than the continuation of the series. And, of course, there hasn't ever been so much as a rumor hinting at Half-Life's demise. As what is arguably the biggest franchise on the PC platform, there is no reason for Valve to stop producing the crowbar-swingin' good times."
So if you're a PC player, buy Team Fortress and Portal individually. Through Steam, you can.
If you're a 360 player, yeah you're stuck with the Orange Box. But since the only game included in the Orange Box that appeared on consoles previously is Half-Life 2, and a markedly inferior version at that, it shouldn't be so painful.
Anyway, I think you're looking at this the wrong way; the value of Ep2 + Portal + TF2 is at least that of a full game. They threw in HL2 and Ep1 for free. I suspect that's why they cancelled the Black Box; they would have been charging the same for it as the Orange Box, while delivering less.
Hans