You sound like that gimp that said that foden would sit on the bench for 6 years.
Give your head a wobble
Foden's oppourtunity for playing time is way, way bigger. There's no comparison. Alvarez's main compeition is 22-year-oöd Erling Haaland, the best striker in the world. Not even Sergio Aguero in his prime would be a starter ahead of Haaland whose goalscoring numbers is unprecedented.
Since Pep won't change the system to accomodate Alvarez, I don't really think he has a future in Man City as a starter unless he completely reinveny himself.