
It's possible something could be worked out, but it would end up being really expensive. Both Sony and Microsoft have ceilings on single DLC release size, the PeTI is designed to always grow. They would need a size projection for Valve to appropriate and then set a fee structure for allocating that space. Microsoft and Sony would not allocate the amount of space it would take to host the ever expanding content the users would create. It's all about content hosting and furthering a business strategy. In short, PeTI for consoles would be a waste of space and time, for both support an the editor, and if it was to ever happen, it would be in a sequel. Same exact engine, just new objects and input. All that happened there was a download of the new mechanics and objects. If Valve were to port it to Ps3/360, it would practically mean redownloading the entire game, and coming up with more stuff that makes the CD files work with the downlaoded files. I wouldn't want 6 gigs of extra stuff on my console. Before PeTI, the PC version was 7.6 gigs of space, it now takes up 13.8 gigs of space (in my steam apps folder). One could simply say that you can include this as a free DLC, but here's the problem.

The PC version basically reads off a list of numbers in a certain order and "draws" the level, rather than loading up a premade set of polygons and entities. When PeTI was launched, it was basically a redesign of the entire engine to be able to load up 3d grid based puzzles. The PC Portal engine and the console engines are two entirely different things.
