It already does. You can put linux on the PS3 and have all the homebrew you want. Emulators, media players, games... it's all there.
Even if you don't want linux homebrew, there's already OTHEROS homebrew. There are two examples at ps2dev. So you have two ways of doing homebrew on the PS3. What more do you want?!?
The only thing I'd want is hardware access to the RSX from linux for hardware assisted 3D.