It really depends on where you're working, and what you want - if you're based west-side (Citywest, Clondalkin, Tallaght, ParkWest etc.) then it wouldn't be too bad as road links are good and traffic only really builds up from Newlands inwards at peak hours.
If it's a question of affordability or getting more house for less money, then you need to consider all of the aspects of moving somewhere that presumably you don't know, and where you have no family/friends ? If the latter is the case, then it can be hard to settle and stick at it, plus you can wave goodbye to socialising and late nights in Dublin etc. !