The one thing I do believe is that Bret would never have gone along properly with Attitude. While he could be hypocritical on some stuff, the one thing I always took was for better or worse, he genuinely believed he was a role model and him being involved in that would have been distasteful to him, not to mention Austin was clearly intended to supplant him.
Austin was the perfect catalyst in many ways, and the injury at Owen's hands sealed the deal. However, what might have been had Pillman NOT rolled his car and come in crippled? Attitude would have happened with HIM at the helm and it would have been crazier. Bret may then have been more interested as it would have been him vs Pillman, two Stampede guys at the helm with Shawn in the wings for the winner.
Ultimately though it's academic as Vince was the one who decided he no longer wanted Bret Hart. Whether the company was in true "financial peril" we'll never know, but he clearly had second thoughts over the long term deal he signed with Bret... perhaps once he realised he COULD be an ass backstage, just hadn't been.