Obviously Lurie and Roseman have had a lot of success, and in fact, Lurie is probably about as good an owner as there is in sports (certainly in Philly, at least until Middleton figured it out). But he definitely became more meddlesome post-Kelly.
If they do fire Sirianni and want to hire a proven NFL coach (for the first time ever) their management style would have to change.
If they don't fire him, bringing in seasoned coordinators won't necessarily fix everything if everyone isn't on the same page. That's where you'd just be repeating the mistakes of the Pederson era and possibly just wasting another year (or two - is it actually reasonable to make the benchmark for next season Super Bowl or bust now?)
The defensive failing was equally the coaches and roster (i.e. Howie). The offense is probably easier to reboot. I don't think it's guaranteed Johnson is gone (and that's where the issue of how much say Jalen gets also comes in, which is also a repeat of the Pederson era).
Of course Reich is also out there which could be a situation where everybody's happy (the kind of coach the front office would want to bring in who also happens to be Sirianni's pal).
Everyone thought Sirianni was a genius too. And that Lanning was terrible. And that Hurts was going to be a five-time MVP. There is plenty of blame to go around. But as always, in every sport, it starts at the top. The good and the bad.
Kind of crazy that it isn't just Lurie who never hired a proven NFL head coach. Khayat, Williams, McCormack, Vermeil, Ryan, Kotite and Rhodes were all rookies. Marion Campbell, one of the biggest failures, was the only one who'd done it before post- Kuharich.