How will it be an issue for the PMLN? It is going to unite the two said parties. Both will be visiting each others mansions, having lavish parties... women, drugs, everything. These guys are pretty crazy and their unstated alliance will grow. PMLN if it wanted to topple the government could have left the coalition and abandoned the ministries it had. They never did it-they never formed an opposition.
It would b interesting to find out what will happen once PTI comes to power.
We can expect PTI to join the opposition if they do not win an outright majority.