Don't want you to feel like you're being ganged up on here, but what leads you to believe that the owners are particularly trigger happy?
The only managers they have dismissed are Sousa and Sven. Sousa needed to go, the amount of damage he did to a side that were play-off semi finalists in the previous season was crazy, some of the performances under him were genuinely distressing, Pompey springs to mind... So I think they were right to pull the trigger in that instance.
With Sven, he was given a fair amount of time - he didn't achieve promotion in his first half season after heavy backing and instead of sacking him, the owners backed him heavily once again in bringing in his own players and only sacked him when it was clear that we weren't getting the level of results that they deemed their investment required.
I personally think Pearson will be here for the start of next season and will only be dismissed if it becomes clear that we aren't progressing in our challenge for promotion.
All in all, I think they've been fairly patient considering the amount of money that's been spent.