First off, exclusivity deals are not "disruptive". Consoles have been doing it since forever.
But Tim Sweeney is so smart that I feel like he's lying to keep publicity on the good side. Because he has to know that lowering revenue split is not a good way to compete with exclusives; *getting your own exclusives* is. Valve can take that extra revenue and use it to pay studios or partially fund development, like consoles already do (or Epic supposedly does). Or only offer a good revenue split only for big publishers (which they already do) in exchange for an exclusivity deal. Or start refusing to give out free keys to indie devs unless they sign an exclusivity agreement, indie devs who don't have a choice if they aren't picked up by the heavily curated Epic store whose audience is mostly Fortnite children.
Tim Sweeney HAS to know all this, so what's his play here?