We are not going to make a change until CL football looks impossible to get, we have seen this story for last eight years. We've only sacked managers when CL football is in question, two of them were let go at the end/after the season and Mourinho basically made it impossible to retain.
I don't think there's a top manager out there who would suit us, honestly. Conte style is just too abrasive, and I just don't see how he'll mesh here. Same goes for Zidane, did a tremendous job at Real Madrid but the quality at his disposal was unreal, and they had a habit of crossing repeatedly aiming for Ronaldo's head. All top managers have been snapped up in past few years, we'll have to wait for one of them to be free. But, question remains, will we be proactive enough to make a change? I don't think so. Our board is quite risk-averse so it'd take a mixture of a very poor run of form plus good timing of a top manager being available for this to work out.
Note, this is not me saying, there's no manager who would be an upgrade on Ole. Far from it, just saying there aren't any top managers available, who'd suit us, right now.
I have always said, giving him permanent job in March was a major mistake. We should have waited until end of season to make that call. Our end to the season was abysmal, and there were already questions back then, if he has it in him to turn things around and arrest a decline. We went for a full squad clear out and backed him to the hilt.