Not ignoring it.
The 28% approval rating for Pat Toomey from PPP could be an outlier. We are going to see lots of polls.
That said -- Pennsylvania is tilt-D, and Toomey barely won in one of the most Republican-tilting elections in Congressional history. If 2016 is the same sort of political climate, Toomey wins, and Republicans get more seats in the Senate on the way to getting the ability to change the Constitution practically at will in January 2019 as they gain even more Senate seats in the wake of the 2018 election.
This said, nobody can predict what the political climate of 2016 will be. The Koch family has committed nearly $900 million to the Congressional campaign of 2016. Money shouts in our political order, and it may now rule.
Pat Toomey will not lose in a landslide -- that is certain. Unlike Rick Santorum he has not abused power as a toady of the current President; unlike Pat Corbett he has not soiled himself protecting a corrupt institution. But in a high-turnout election as is the norm for a Presidential year, he will have trouble convincing Democratic-leaning voters to vote for him or (more likely) stay home.
We can predict some of the features of the 2016 election about as reliably as we can predict the Olympic medal count for China, any winner of the Nobel Prize for medicine, the TV program line-ups of 2016, or the World Series.