Organized play, not competitive play. Not something for players who aim to start winning tournaments as soon as possible, because you're right that they will likely always need to buy a lot more cards, but something that's an obvious choice for someone who's preparing for their first GNK and is hoping to win at least one game, or who's frustrated with how very badly their core set decks do at their local weekly meetup.
It would be nice if the champion decks provided new players with a top-level deck they could open and play, but I agree that this is unlikely to happen due to rotation and the MWL. This years' will lose fewer cards than one might think to rotation, but the cards they'll lose are pretty important.
But I think it would still be very helpful to have a second purchase that lets new players substantially improve their core set decks without locking them into one deck archetype, or requiring them to consider all 31-42 data packs, or having caveats like "this Runner half of this deluxe expansion is great, but the Corp half is pretty underwhelming" or "you'll also need to get this data pack and this one if you want any way to deal with agenda flood or meat damage.". That's what I'm hoping Terminal Directive will be.