Mass Effect 2 and 3 are too large, and putting the DLCs in will require a lot of space. You need extra space on discs for the game to perform well. Mass Effect 3's DLCs including patches equal up to 11GBs. That's too much to put on one disc when the game itself is already large. Plus, the DLCs cost a lot, which means they will not give you this game for like $30 with all DLCs installed.
There isn't a "Mass Effect Trilogy: Complete Edition" unfortunately. In the Trilogy edition for PC ME1 comes with all of its DLC but that's it. It would be possible to include all the DLC even if there's not enough space on the disc though. Some GOTY/complete editions for other games include codes for their story DLCs. That way they're still including all the DLC with the game just not on the discs.
the hype of mass effect has worn of by now so the patches and dlc's can get cheaper allot cheaper.
if origin will do this is another question on itself.
the most people want the dlc for the second game so keep them on a price and give some of the mass effect 3 dlc's for free i think most people would enjoy this option.
also since you can download the games now you don't have to pay for the dvd so it can get even cheaper.
also this gives origin the opportunity to make a full version with all dlc's of all the games since its not on a dvd and does not require a dvd to play.
this will get more people interested in trying it and can be sold for a good low price and still give origin a reasonable profit
Downloading from Origin is cheaper but it won't be saved if your PC crashes. BluRay is the best option to include all DLC in trilogy.
