I think in the future there will no longer be exclusives maybe a generation away.
No chance.
The only way we will no longer see exclusives is when we no longer have multiple consoles on the market.
The entire purpose of exclusives is to shift console units or to at least make one console seem more attractive that the others based on the games that can only be played on that console.
Even then without consoles you would likely still see exclusives to some extent. Mostly I am thinking that Streaming Service X would have games that are not available on Streaming Service Y.
It's kind of normal in business though since almost every corporation that is operating in a competitive market is trying to offer some kind of "exclusive" service or product that you can only get by giving your custom to that company.
I don't see why gaming would be different somehow.