Depends how you look at it.

If you're using a web page that is mostly just a CRUD app, sure, no-one will wait around for that, but if you're shipping a version of IPython that can run in the browser, I think people would be pretty happy about it as long as the blob can be cached and hopefully shared between sites since it's on a shared CDN.

Caching is hard because we serve the same code from so many different servers. IPFS fixes that by referring to files by a hash of their content. Commonly used binaries will be cached on your browser, and every app will refer to them the same way.