Sorry about the delay @rainingsnoring, the discussion about the bases has been discussed as a possibility on Iranian TV and by prominent Iranians and geopolitical experts during interviews (I have heard it on Judge Napolitano and other shows). It's also evident in the fact the majority of Iran's initial attacks focused on degrading or destroying the American bases as opposed to attacking Israel which every expert had been predicting.
However it was during Mojtaba Khamenei's first speech as the new Ayatollah that it was mentioned as a serious condition, in part 5 he says:
““The fifth part of my speech addresses leaders in certain regional countries. We share borders with 15 countries and have always wanted, and still want warm relations with them. But for years, the enemy has been establishing military and financial bases in some of these countries to secure its dominance over the region.
“In the recent assault, some of these military bases were utilised; naturally, as we had clearly warned in advance, and without committing any act of aggression against those regional countries themselves, we have only targeted the US bases there. After this, we will have no choice but to continue this course of action. Though, we remain committed to the necessity of friendship with our neighbors.
“These regional countries must determine their position with regard to the aggressors who’ve attacked our beloved homeland and murdered our people.
“I advise the leaders of regional countries to shut down those [US] bases as soon as possible, for they must surely have realised by now that the US’s claims of ensuring security and peace have been nothing but lies.
“Shutting down US bases in the region will enable those governments to strengthen their ties with their own people, who are generally dissatisfied with the humiliating behavior associated with those bases. It will also bring an increase in their wealth and power.
“I repeat: Islamic Republic, without being in pursuit of domination or colonisation in the region, is fully prepared for unity, and fostering warm, sincere, reciprocal relations with all its neighbours."
(It was extremely difficult to find a full copy of the speech, most papers including Al Jazeera just had extracts, finally found it on a Pakistani news site)