Sinn Féin will return us to the IMF if in Government

The recent new book about TK Whitaker has a passage where he states with colleagues that if something is not done regarding the economy it might be better if the Fianna Fáil Government of the day applied to re-join the United Kingdom, the situation was that bad.
Despite all we know about Sinn Féin and their Marxist economic ideology it looks like a real possibility that enough gullible citizens of our Republic might possibly put a SF-led left Government in power after the next election.