I get why people want Thibodeau replaced, and I agree that his refusal to experiment with different line-ups in the regular season bit him in the end. But it's not as simple as "replace Thibs and win," because a lot of coaches are trash or mid. Thibodeau's legitimately one of the better coaches in the league, and you're not guaranteed to land a better coach in replacing him.
Last season's roster was perfectly tailored for Thibodeau and overachieved like crazy. This roster wasn't a great fit, yet it still made the ECF. So, I'd be willing to see if Leon Rose and Brock Aller can use this offseason to put the final tweaks on a very talented unit. If Thibodeau gets outcoached again next year, or if the pieces still aren't gelling, then it's work the risk to move on from him.
Yeah, he's a flawed coach. But Thibs is consistently going to give you a competitive team. The Knicks have gotten closer each year under him, and Brunson loves him. After the gauntlet of bad coaches we witnessed post-Woodson, I think the best Knicks coach since the turn of the century deserves one more shot...even if I do get frustrated.