I think it's a little too obvious for Vince Gilligan's writing style that Walt sees the other founders of Gray Matter and suddenly wants to go after them.
Here's an unforeseen (and maybe unlikely) theory for you:
The founders of Gray Matter just got on TV and made up a bunch of shit about how Walt did nothing, other than help create the company name. Walt's story (whether correct or just his preferentially skewed version of the story) is that he was a legit founder and a brilliant scientist who helped start the company. However, the other founders of Gray Matter just rewrote history by telling their story and having people believe it.
So Walt formulates a plan about how he is going to win his family back. Win his legacy back. Clear his name.
He's going to pin all of the meth business on other people, most likely Jack's crew and Lydia. Maybe even Jesse. Or maybe he makes amends with Jesse by clearing his name as well. Hell, maybe he even pins it on Gray Matter somehow...convinces the public that their millions were made illegally in the meth business, and that they kicked him out because he didn't want to be complicit with their plans. He somehow devises a way to show that Gray Matter pinned everything on Walt because he was going to go public, but that he didn't go public initially because they gave him hush money. Then when he threatened to go public, they got the DEA involved in an attempt to put him away, but Gray Matter's thugs (Jack's crew) got greedy, killed the DEA, and took Walt's hush money. They then kept him quiet by threatening to kill Jesse and/or turn Walt in to the DEA if he didn't disappear.
Walt proves himself one last time, showing that he has not developed fully into Heisenberg. He's still Walt the genius that can do anything. Walt, Jr. will no longer hate him because he's convinced him that he wasn't at fault. Skyler keeps her fucking mouth shut, lest she get herself into trouble for being complicit with Walt's voluntary meth dealings, and she regains some respect for Walt due to him saving their family from continued public humiliation and criminal prosecution. Same with Jesse. Marie has no evidence and can go fuck herself with a purple dildo.
Ultimately, Walt dies of cancer. But not before he re-establishes his legacy and clears his name, at least to some degree so that his family is safe and those that he despises are royally fucked.
Or, more realistically, Walt goes into a witness protection program as a Power Rangers villain: