Will we be able to stream Xbox 360 & Xbox Original Games in future too?

Xbox One games won't work on the 360 and vice versa but in the future you'll be able to stream Xbox 360 games on the Xbox One, a bit like Gaikai.

Not all Original Xbox games is able to be played on Xbox 360.

Games needs to be added to the backward compatible library to be able to be played on the 360 or the One. Seeing as they have stopped bringing games to backward compatibility, team has been reassigned to work on Project Scarlett, we might see more games
added in the future.

Hello,

There's no "restrictions" in launch games for various consoles. An Xbox 360 Slim should play all games that it would play if it was an original Xbox 360. The only difference is that original Xbox 360's disc drives get old as the time goes on and sometimes don't
hold up as well. This isn't a fault of the console, it's the fault of normal wear and tear that using a console has with it.

Microsoft doesn't make it so you have to go and buy a new console if a new version of a game comes out, that would be super silly. As long as it says Xbox 360 on the game box, it should work in the Xbox 360 console, original or slim. If your asking us if your
disc drive will have issues in the future, we aren't fortune tellers (as much as I'd like to be able to tell you the future ).

You can Buy "original" Xbox games on the 360 so I would assume in time you'll be able to stream some 360 games.

Keep in mind that classic/games on demand are about 300% actual price if you download them.

No, Xbox One does not have backwards compatibility with Xbox 360 games, but soon this will change. Microsoft will get a streaming service to play all Xbox & Xbox 360 games in the near future.