How 'The Batman' Didn't Lead to a New Justice League Cartoon

 A while back, I wrote about how Superman: The Animated Series did some work to set up a Justice League Cartoon.

That Show did exist, but most of the work- like introducing Hal Jordan and Aquaman to the team- didn't go anywhere.

Well, after Justice League Unlimited ended, The Batman began!

At the end of Season 4, they had a big Finale Episode which featured a group of Aliens known as The Joining.

Martian Manhunter would debut and help save the day.

Season 5 began with a two-part crossover with Superman, featuring Metallo, Lex Luthor and Poison Ivy, doing a beat-for-beat remix of their interaction in Hush.

After that, a guest-starring Episode for Green Arrow (one of my favorite JLA Members).

The two team up to stop Count Vertigo and there's mention of the Justice League.

After another Episode, The Flash would show up to help him stop Mirror Master.

Kind of a weird connection- he's voiced by John Laroquette, who I just covered as the Narrator in the TCM Remake!

After another non-team-up Episode, 'Ring Toss' would bring Hal Jordan into the, um, TBAU (I guess?).

Hijinks would ensue with The Penguin getting the ring for a bit, but it's Sinestro who's the main villain.

Yes, just like in Superman: TAS.

4 Episodes later, the last piece is put in place as Hawkman debuts!

He teams up with Batman to stop Black Mask and Shadow Thief.

That brings us to Episodes 12 and 13- Lost Heroes.

Some force keeps kidnapping the powered members of the League exploiting their weaknesses!

That leaves Batman, Robin, Batgirl and Green Arrow to save the day.

That and stop an Alien Invasion.

As you probably guessed from the Title here, that's it.

This didn't lead to a new Cartoon with this, followed up only with a Comic called The Batman Strikes...which ended in October of the same Year.

Granted- we got The Brave and The Bold in November 2008, which is (of course) a great Show and is all Team-Up Episodes.

That Show brought together a version of the Justice League International- which features Fire, Ice, Booster Gold, Blue Beetle and Guy Gardner.

We would get a pair of Episodes eventually with Superman, one of which also features Wonder Woman.
That would be in Season 3 (of 3), mind you.

I guess my question is this- Why is it so hard to set up a Justice League Cartoon?

Anyone know?