Kevin Feige has spoken regarding Spider-Man leaving the MCU:

“It was a dream that I never thought would happen. It was never meant to last forever. We knew there was a finite amount of time that we’d be able to do this.” #D23 #D23Expo (Source: https://t.co/ipUzQWlhIt) pic.twitter.com/Mnuo595eaV

— DiscussingFilm (@DiscussingFilm) August 24, 2019