I think that the economy keeps only a few years in its boom. That makes people think that workers are always in a less advantageous bargaining position. We all have to study how difficult is for an employer hire a worker that matches with his expectations when unemployment is low. I'm sure that wages must tend to rise when it happens. Therefore I think that the Phillips curve is not lying about the mecanism of labor market. Although it's a bit under the mean and there is room to improve. Bargaining power I think is lower nowadays regarding low income jobs.
In addition I think that the non-employment Phillips curve is a little bit ambiguous because you can't know exactly what are the reasons that make people not to join the workforce. There can be an excess of wealth accued or simply they are graduating to join the workforce earning a higher wage. Therefore I think that non-employment measure can have a few errors and unemoloyment rate could be more accurate.