Rav Miller bases his statement regarding TV causing a loss of Olam Haboa based on the Mishna in Sanhedrin 10:1 that says a person loses his Olam Haboa by reading the wrong books since it corrupts his mind. Rav Miller says the television is 100% worse than the seforim chitzonim. There’s more to what he says (you can listen to Rav Miller in the post above) but that is the core in a nutshell.
And I don’t see anyway around the face value of it. I mean, if it is never turned one, that may be analogous to not having it. But if it is watched, the seforim chitzonim issue comes to fore.
And frankly even the so-called “clean” shows have completely assur content, at the very least during commercials. And even during the so-called “clean” show, you almost if not always have a (even goyish) woman dressed untzniusdik per Torah standards (i.e. uncovered elbows or knees) – which itself makes it all assur. (This point is more relevant to men than women, but you still have the aforementioned issurim, even for women.)
Wolf – I agree with BP Totty. Perhaps they somewhat are more analogous than you realize. Just like you won’t get anymore sunburn if you leave the sun (even if you don’t regret), you won’t lose the future olam haboah you earn after you rid your home of the TV.