I see this very similar to IPv4 and IPv6, and adoption. Non content addressable URL addressing simply is "good enough" for most use cases, and bittorrent is "good enough" for serving content durably and somewhat in a content addressable manner (file hashes, magnet torrents, immutable torrents). Do we need IPFS URLs? It doesn't appear so, it seems like a solution seeking a problem. IPFS gateways will always be a target for abuse and copyright claims as well.
If you want to reference resources securely, https://developer.mozilla.org/en-US/docs/Web/Security/Defens... is available and widely supported.