Not until 2015. PiS will get 39% and will team up with Solidarna Polska (8%) and PSL (10%).
Except Solidarna Polska haven't got a chance of getting such a result. PiS would also have to do something that they've never done, at a time when they cannot get higher than 30% in the opinion polls. The PSL are also highly unlikely to get 10% if PiS get 39%.
Only a PiS-led coalition would be able to form a cabinet.
Let's take your hypothetical scenario of PiS getting 39%. They would still be forced into opposition by the current electoral mathematics (PO, PSL, SLD and RP all voting against them) - therefore guaranteeing another 4 years of opposition.
Kaczyński will not be the PM but Gliński will.
Glinski is a non-starter. He lost the vote of non-confidence, and he would be widely seen as a Kaczynski puppet.
Kaczyński will be voted the lifelong honorary chariman and elder statesman of PiS and will retian a prominent consultative role.
Which is why PiS would never enter a coalition with the elephant in the corner. The other parties know exactly what his game is - and they won't be fooled.
If the forthcoming IV RP is not to your liking, you're free to leave.
Fortunately, we have nothing to worry about - PiS have no chance of getting elected with Kaczynski at the helm.
The real question now should be - who will lead PiS into the next parliamentary election? Will the party really want to keep Kaczynski there if they know that they can only get 30% of the vote yet again?
Polonius, what you completely fail to understand is that disillusioned PO voters are not going to vote PiS - they will vote SLD, PSL or RP. The decline in the polls of PO is mirrored by the rise of those parties - not the rise of PiS.