Since spiderman is owned by sony now but happy is apart of the disney MCU.

I think thats going to be really confusing and destroy the clear Cinematic Universe that Feige build. Its going to be a mess. I think he is going.

I think now they will use him with young Avengers or any new hero like iron lad.

Happy is a character owned by the MCU, Sony owns Spidey so their screen time will be limited together.

Maybe they wouldn’t include him in future movies

Happy is still owned by MCU and in the next spiderman movie maybe he would be back with pepper