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and broadcast journalism is no part of the press at all

Of course it isn't. At that time Franklin hadn't harnessed lightning and Tesla hadn't invented radio.

I'm not sure you understand my position. I say that broadcast journalism is not part of "the press" because broadcasting is licensed by the government in a way no ink-and-paper, literal press ever has been.
Wireless communication was indeed developed long after the First Amendment was ratified, but that is not the right criterion to use; if it were then the high speed press--which has completely superceded the technology of the founding era--might logically be subject to license requirements like broadcasting is (not that I like the thought of giving anyone ideas!). No, the point is that wireless communication is a technology which enables broadcasting but did not create broadcasting. Broadcasting is, rather, wireless communication in clear channels created by government censorship of we-the-people.
There is a perfect example of a medium which is not created by government censorship, and which logically falls under First Amendment protection--you're reading it right now. It wasn't the government's fault that the Internet didn't exist in 1950, but now that it exists as an enabling technology for we-the-people to publish our political (and other) opinions the government has no right to censor the expression of our political opinions on this venue.

But broadcast journalism is great entertainment.

That is indeed its function, entertainment.