Probably not. There was a significant swing away from the PDs, and the magnitude of some of the defeats (Fiona O Malley's, Mae Sexton's) was such as to ensure that they had lost their seat a long time out. Colm O Gorman was never going to win a seat, Tom Morrissey was parachuted into a more "affluante area" (to his detriment), John Minhan had lost the respect of most of his constituants by 2005, and John Dardis and Kate Walsh were not going to run again. Michael Brennan was running in a no hoper constituency. The rest of the candidates were paper candidates who hadnt a hope of winning, even culminating in an SDP (1995 Bootle Strand Moment) where the Christian Soldarity Party, and the Immigration Control Platform beat
PD Jerry Hannon in Dublin Central. Equally, the likes of Peader O Donnell polled in the hundreds, while the likes of Redmond, Murray, Collins, Lacey, and Doyle all came last in their respective areas
It was a fight of between 4-6 seats . Had McDowell pulled out of Government, he would have retained his seat, as the Bertie v Enda factor would have been damaged quite a bit, as Bertie would have had to pick up the flack of a distrusting former coalition partner. Equally, had Harney been leader he would have taken the seat (given the limited platform he would have had). Removal from Government would also have given Liz O Donnell a fighting chance of retaining her seat. As such 4 seats was a strong possibility. The seats which needed to be fought hardest for were Tim O Malley's and Tom Parlon's. They were the difference between 4-6 seats, and outside of Government, they could have washed their hands of their respective departments.
Naturally, that is all very hypothetical, however, had McDowell pulled out of Government in 2006, I can guarantee you that the PDs would still be in existence at the moment. Granted, the party would have been wiped out locally last month (as it would probably have been back in Government in 2007), and would be on life support until 2012