Re: forcing it in
I think you've just proven why 'rumours' should be taken with a massive pinch of salt.
Mind you, this 'rumour' is really nothing more than 'personal subjective opinion and uninformed speculation', given that HL3 hasn't even been confirmed as existing, let alone being specifically locked to an as-yet unfinished operating system.
You *did* remember that SteamOS can be installed on ordinary home-built PCs right, so even if HL3 was released for SteamOS only ordinary users could simply install SteamOS on their existing PC? No, because that wouldn't fit with your conspiracy theory...