They can look for new talent, but the Russos have a proven record with them. While I don't care for their prior films, I think it's clear that they understand the comic book genre. Look at those 4 films. Those are arguably the 4 best in the whole MCU. At worst, they're all in the conversation for best MCU film. The Russos get it, and in a way that we are not seeing even from someone who knocked it out of the park on his first attempt like Taika. Taika is a good director, and a good writer, but while Ragnarok is one of my favorite, this followup is among my least favorite.
We can agree to disagree, but I'll say this, the Russos are the clear MVPs of the MCU directors roster. Thus far this phase, it's felt like a second unit effort. Marvel needs to get their best players back in the game, especially if they're going to go extra with the amount of content their releasing. It just so happens that this middling storytelling effort has coincided with a massive increase in the amount of MCU content available. So it feels like a wave of mediocrity that's really taking the shine off that Endgame high.