I actually don't think that all studios will welcome Nolan. WB gave him a lot of creative freedom and money, something that doesn't always payoff. A lot of people were not impressed by Tenet or even Interstellar and those movies failed to make a billion dollars which is what movies with such budgets should make. It might hurt his creative freedom, or maybe he needs that freedom hurt to make more mainstream movies. I think his best fit after WB is Universal Studios. Universal is a lot more competitive then what people give them credit for.