yes.. but there is this big factoid out there that may shift your perspective on that graph. By some measures Pennsylvania is routinely the largest net attractor of freshman matriculating into college from high school. So it seems Pennsylvania is attracting 12K more freshman than it exports per year, of which many will earn degrees here.. that our net loss of those with bachelor's degrees roughly an order of magnitude less, you should wonder what is happening to most of those newly minted graduates.. might they be staying here? The net loss of those with either a bachelor's degrees or higher is clearly a lot smaller than the number of folks the state is taking in before they earn their degrees. i.e. we are 'producing' on net more degrees that we are losing to migration it seems to me.
So lots going on in the dynamics of course.. but the bottom line is that interpretation may not always be straightforward. I personally want to do a study to see if there is a correlation between the net migration rates of those with less than a high school degree and states that are bit attractors of college matriculants. Just seems to me rational that families who know they are going to be sending their kids to college in PA will have incentive to move here just soon enough to garner in-state tuition. Call it a hypothesis.