I think you may be making a few assumptions here. I don¡¯t think it will come down to Thor making a choice to be a hero. We will see shortly. Not quite sure what it means to ¡®take too long¡¯. Perhaps that is just your personal preference for shorter overarching stories. Aaron has one overarching story, so logically it will take as long as he is writing the character to resolve. Is it his fault that he was popular and therefore got to keep writing the character for this long?
I would like for this arc to end in a similar way to stories that have deconstructed what it means to be a hero, to live this life, with Spider-Man, Batman, Daredevil, Tony Stark, etc. This hero is brought to a low point, 'deconstructed' and the 'parts' that make them a hero are examined to determine which things matter and which things do not.
Take away Starks money (or sobriety, or reputation), or break Batman's back (or kill his ward, or undo his work by freeing and uniting his various rogues), they come back.
With Thor, is it the divine birth that makes him 'worthy?' Not really. Lots of character have been born gods, ranging from other heroes like Hercules, to those we see less of, like Horus. It doesn't really make them special. Gorr was indeed right, in that sense.
Is it the hammer? Not really. Lots of people have used Mjolnir itself, and there are lots of other special weapons out there, like Odin's spear Gungnir or Perun's axe or Terrax's axe or the Ultimate Nullifier or the Infinity Gauntlet.
Is it the amazing power he wields? Again, not really. Lots of other people have similar levels or types of power, like Wonder Man, the Sentry, Blue Marvel, Hyperion, Gladiator, Gabriel Summers, etc. or even more specifically, have wielded *the power of Thor itself,* like Red Norvill or Beta Ray Bill or Storm or Jane Foster or Eric Masterson.
Each of these individual things can be looked at, and discarded, as not being the 'one thing' that makes the *character* of Thor important.
Is it being specifically the son of Odin? Again, Odin's got other kids, both adoptive, in the case of Loki, and biological, in the case of Baldar and Angela. Heck, he's been called, at least metaphorically, the 'All-Father,' for pretty much his entire Marvel Universe history, so, again, that's not what makes Thor special.
And yet, at least in the past, he has been special. He defeated Atum the God-Eater from the inside, after many of his divine peers, presumably his equals, at least in power and 'divinity,' fell in battle against it.
I would like for this story to move along, and show what makes Thor a hero, not what makes him 'worthy' of the hammer, because the hammer isn't what defines him (I used to read 'young Thor' stories back in the day when he used a sword, after all), but what makes him worthy of reading about.
It is interesting that the character of Thor is so well-suited to long-form storytelling. Unlike, say, Professor X or Mr. Fantastic, who 'used to be' WW2 veterans or active in the Korean War, but have since had to be retconned to be younger, the Thor of Norse lore has been around for millennia, and is immortal, so it matters not at all that his character has been in publication for decades, and will be for decades longer. Indeed, that very longevity makes it harder to rationalize severe change to the character and the trappings that surround him. (Asgard, for instance, which was supposed to be around for tens of centuries, but, once mortals started writing about it in the 60's, seems to get blown up / massacred / relocated distressingly often, making one wonder if the previous 1000 years or so were just an anomaly. But that's a lesser problem that afflicts Atlantis, Attilan, Wakanda, etc. which have been around for many centuries, and only 'recently' seem to get blown up regularly, making the current rulers appear unintentionally to be the least competent ever, since stuff like this never happened when their dads were in charge...)