Could STEAM be brought to PS or Xbox?

[Kerotan]

Dgc1808 said:
When you say Steam on PS4/X1... what does that entail?

i guess it would mean steam could set up a store to sell pc games not already on consoles. sony and ms would still get a cut. 

but this has me thinking why don't MS and Sony get most pc games to port them to their consoles...