My district (the 18th) is so heavilly conservative that we could probably absorb the rest of the Mon Valley without any lasting damage. Ditto for Johnstown and the adjacent conservative trending districts.
OTOH, Pittsburgh itself is still shedding population and can easily add the remaining most leftwing suburbs such as Wilkinsburg. These changes would make less, not more, gerrymandered districts.
Perhaps the fact that he survived even in bad times proves that the lines can be smoothed out without endangering him or another R who runs in the 18th.