Sage advice. I would advise pretty much any Hollywood studio to not do the MCU model.
I don't think Feige was saying they shouldn't follow the MCU model -- on the contrary, by saying they shouldn't get ahead of themselves, he was saying they
should follow the MCU model. The MCU started out very slowly, doing standalone movies with only loose connections between them, and only gradually established stronger ties. Their priority was making each individual movie as good as it could be, and that made them
worth tying into a larger whole later on. But other studios overlook the importance of laying strong foundations and rush into shared universes prematurely, focusing so much on the whole that they neglect the quality of the individual parts. That's what happened with
Amazing Spider-Man 2, with the Tom Cruise
The Mummy and the abortive shared universe it was supposed to spawn, and to some extent with the DCEU, which rushed into doing flawed crossovers and flailed until it finally just gave up and focused on strong standalones. Their problem was that they followed what they
thought the MCU model was, but they forgot how slowly the MCU actually started out. They tried to rush to the payoff without doing the work to earn it. That's what Feige means when he says not to get ahead of themselves.
The only other franchise that's come close to getting it right is is the Legendary MonsterVerse, which laid its foundations with effective standalone Godzilla and Kong films before doing a team-up movie (although that team-up movie was awful).