Yes, he's likely correct but not likely in the long term as long as the pressure keeps up. I could be wrong, but I don't think Rubio will be selected as VP by Romney because enough of us have made a racket about the NBC issue. The ABC news report were probably correct that inside sources said Rubio was not being vetted, and Romney had to come out to say Rubio "is being vetted" after Hannity, et al, came out chanting, after hearing about the report, - Rubio, Rubio, oh my Rubio. ;-) The effort is working.
Hannity, BTW, did his whole pre-taped one hour show on Rubio last night, almost as if to introduce Rubio to his audience as the VP candidate. And there was even mention of Rubio as President at some time in the future. Yes, Rubio has been a frequent guest of his, but it's outrageous that Rubio should get so much play on Hannity's show!