Kyle has some weaknesses and blind-spots but is overall a great coach. I complain about him a lot (and I think receiving first was a mistake) but I don't want him fired by any stretch. The defense definitely took a big step back this year so I'm not surprised Wilks was fired.
None of that matters and they win this super bowl if the right side of their offensive line didn't play like they were a high school JV team in pass protection - bottom 1/3 of the league by PFF (even with the best left tackle in the league) all year long and it was always extremely apparent when they played good, smart teams who just abused that fact. For comparison, the 3 teams they faced in the playoffs all had offensive lines ranked in the top 6 for pass protection. Haters love to point our Purdy had a lot of weapons but always ignore that he had very little protection.
The top priority has to be to fix the offensive line.