This is what we said about Mario until he landed three straight excellent quarterbacks.
Venables deserves blame for his quarterback decisions (particularly letting Dillon Gabriel walk and running with Jackson Arnold), but it is not like Oklahoma was the only team that wanted Mateer. I shudder to think about where Miami would be if we had gotten our wish and landed him.
Maybe Venables can just never field a worthwhile offense, in which case, sure, give him the boot. But given how good Oklahoma always is on the defensive side of the ball (without utilizing almost any transfers) and the aforementioned resources, I'd give him a few more swings at landing a legit QB before I kick him to the curb.