Increasing the limit makes the network better at storing data, which will make people use it more for storing data, but we're already trying to store this data forever without knowing how we're supposed to make an infinite hard drive before we run out of hard drives, so the less data we store on the network, the more time we have to figure out how to make an infinite hard drive

If we're already gonna figure out the infinite hard drive thing more than fast enough, then we can get more benefit from Bitcoin as a storage server and still get the infinite hard drive in time