I think it's highly unlikely that he'll bin Martinez off at the end of the season, even if we drift into mid-table nothingness. Kenwright's still on the board remember, I doubt Moshiri will want to be the man who comes straight in and sacks someone, and Martinez is already talking regularly about having money to spend in the summer and who he's going to buy.
Not meant as an attack on you BD, but I really don't get how you seem so certain about what Moshiri may or may not do. We really have no idea what is approach will be, he's never had this level of influence at a club.
On the one hand you're saying he's a savvy businessmen, he'll take the club forward in the exact right way, he's the perfect investor. But on the other hand you're saying he's not going to spot and act on what 90% of the fanbase have known for months, that Martinez isn't good enough (notwithstanding the recent results against some shite teams aside).
If he is as intelligent and good a businessman as you say he is (and there's every reason to think he is), then he'll also know that in business you need results, in business you need to be ruthless, and in business you need to listen to your customers. In other words, he'd be thinking very fucking hard about whether Martinez should be in charge next season.