I don't think The Young Indiana Jones Chronicles / The Adventures of Young Indiana Jones is EU (in the sense of being debatable as to its canon status); it's an actual Lucasfilm screen production with the personal involvement of George Lucas, and the official Lucasfilm line undoubtedly holds that it's as fully canon as the movies. It's certainly on a different tier from the novels, comics and games.
That said, I do think it poses unique obstacles to toy representation that would probably relegate it to the same status as the "actual EU" - it's probably less-popular and well-known than at least some of the games and such, and of course as a TV series with dozens of episodes, each of which has its own full set of characters, there are so many characters (and vehicles, etc.) to represent it that it'd probably be unfeasible to ever do it all - affording every major character and character "look," every x minutes or so of screen time, etc. the same level of consideration as the feature films would mean doing perhaps hundreds of TYIJC-based action figures; it'd make the overall action figure line anywhere from 50% to 95% devoted to the show. I personally wouldn't have a problem with that (not because I like the show vastly more than the movies, but simply because it'd evenly represent the entire Indy canon), but I do of course recognize most people just wouldn't go for that.
That said, I'm personally a bit more interested in LEGO than action figures anyway, and with LEGO I can always improvise my own "fill in the gaps" characters, locations, etc. for whatever doesn't get officially produced, so that's cool, but I do hope the LEGO group sees fit to bless us with at least a few Young Indy sets (and Temple of Doom ones as well, while we're at it!).
