On what basis do you think this is likely? What part of IPFS gets faster when more users are online? If the file exists on a system in the network, it should make a connection and start fetching the file within milliseconds ideally. It's not like we are distributing multi gb files where more seeders means more speed, this is all just slowness in setting up a connection.

Even torrents take 1-10 seconds to initiate downloads with an absolutely massive network.