I think there was always a potential for transformation towards at least proactively marketing to otaku to provide a baseline income.
Also, if were talking money dumped into development that went no where, the flop of Doremi and the complete stillbirth of Pretty Cure also blew through a lot of capital. In fact, they pretty much had a chain of failures in that space, and yes, Chaotic was one of them. They could have bought a lot of otakucentric titles and been in the black on them instead with less over all effort.
Besides, what did Haim Saban do that would've worked for 4kids? He cashed out, effectively sitting out most of the decade, then bought his shows back cheap after the company that had bought them off of him lost interest. 4Kids was essentially doing this decade Saban did the late 80s and 90s - proactively localizing and merchandising import titles. Nelvana, no matter what they did otherwise in business had a key advantage 4kids could never exploit - they are a Canadian company with a suite of tax breaks provided to them because they produce Canadian content.
Since their were no tax breaks for 4kids to game to support their bottom line, and they certainly didn't seem willing to sit the decade out (though, if they'd focused in on their pure merchandise properties, that too might have worked,) really, following the FUNimation method - becoming a vertically integrated, otaku-driven company - falls out of this. They could even made a lot of their TV plays, they just needed to put out some subbed, uncut DVDs at the same time, and made a point to have shows that didn't need a merch line and TV exposure to generate profits.
Meanwhile, 4kids and FUNi always felt like brothers to me in some aspects. Both became industry powerhouses off questionable dubs of popular material, both of which gained additional heat once the time slots went from random syndication slots to fixed broadcast/cable network slots. They were also both essentially driven by their respective CEOs, and both needed to find sequels to their initial success to keep the companies running.
The difference is what they did to extend their success. FUNi attended some anime cons early on in their existence, and recognized that if they were going to tap that fanatic but profitable base, they had to come to it, not vice versa. 4Kids bought Yu-Gi-Oh, and while that worked for them, that set off a chain in their thinking they never recovered from because they thought, quite foolishly, that it had been their handling and strategy that made that a success, when in fact it was the show carrying the whole thing. Any company that had bought Yu-Gi-Oh and stuck it on air in a regular slot and a listenable dub would've boomed. Ditto Pokemon. It was the right show at the right time. All the effort put into heavy localization, and rescoring -- this was a waste, and certainly didn't help them in the long term. They spent tons on trying the same methodology again, again on other shows only to train wreck every time.
That's my thinking at least.
Meanwhile, while 4Kids has one Toei show, they may not get anywhere with it because they're still making the same mistakes (changes, reliance on a dying or at least nadir-point media outlet, etc.) Even if they weren't making those mistake, they might instead still make a different set of mistakes (like questionable accounting.) I mean, lets say that previous partners didn't find anything wrong with 4kids books. If they were still charging partners large "management fees" that went down on their books as profit, that practice still essentially lead to the conclusion - "we'd make more taking this away from them." If this works, and they get Toei fully in their good graces, they better treat them decently. Otherwise, they'll still repeat a mistake their competitors in this space don't make in the first place.
This also assumes their weren't any riders in relation to bankruptcy in the various contracts they have, or assumes that in bankruptcy recovery, they aren't forced to shed properties to create capital to pay off debts. Essentially, I'm not sure if anything they have right now should be counted on being theirs down the road. If nothing else, this is going to have the rest of their partners checking the books, and that might cost them properties as well.