Dr Roantree told The Pat Kenny Show any such approach would be unfair.
"What these things share is that they would be very expensive, very unfair and fundamentally just completely ineffective in dealing with the problem," he said.
"During the Celtic Tiger we encouraged a bunch of people to become landlords... and they're now approaching retirement.
"They don't want to be landlords, and that's one of the big reasons you have landlords leaving.
"I think what everyone's agreed on is we need a huge amount of more units; we need 40,000 to 60,000 units in the country per year."