Perhaps.. but you've also missed out on another possible scenario.. one which
FF took advantage for decades..
FF used come to power.. and basically drive the country to ruin by overspending, to keep people voting for them. Eventually, the money ran out, and
FF lost an election, letting
FG and Labour back into Government.
FG and Labour imposed austerity, slashed and cut.. and eventually righted the states finances.. but, in doing so, became hated for it.
And the people voted
FF back in.
This time though, when
FG are
Lab are hated, the people may put
SF in instead of
FF. With all the hard work of righting the finances done. And
SF will govern in a period of plenty. If they don't screw it up like
FF used to.. they could be in power for decades.