I found these observations, calling out Reformed and Emergent leaders and urging them to participate in venues such as the Evangelical Theological Society, to be interesting, though a bit uninformed. The writer seems to assume that Reformed guys are avoiding ETS and are practicing "sectarianism" vis-a-vis the larger Evangelical world.
A couple of things here. First, I'm not certain that ETS is the best place to "start attempting to make a difference in the academy." I think it is one possible, even good, venue for doing and sharing academic work; but I also find that many of the conversations there tend to be a bit self-referential and even, ironically, a bit ghettoized. And so, while the writer seems to believe that ETS is "the academy," I'd suggest that it is actually a small, though valuable, part of that academy.
Closely connected with that point, I'd suggest that simply because Reformed scholars aren't "showing up" at ETS (which is a claim that I actually doubt, through my own years of involvement with that society) doesn't mean that they are not "attempting to make a difference in the academy."
If it is not immodest to use myself as an example, since 2002, I've presented papers at the American Society of Church History (three times, spring meetings in 2003 and 2004; winter meeting in 2007), the Conferenece on Faith and History (twice, in 2002 and 2006), The Historical Society (in 2002), The Douglas Southall Freeman Symposium at the University of Richmond (in 2002), and the Institute of Faith and Learning at Baylor Unviersity (in 2004). I suspect that the itineraries of those whom this writer upbraids are similar or even more diverse.
In other words, it is a big (academic) world out there; ETS is one small part of it.
Also, when they moved ETS to a Wednesday through Friday schedule to avoid competing with SBL/AAR, which runs Friday to Sunday, it made the trip pretty difficult for those who have to teach during that time. Granted that others make that sacrifice, I have a hard time rationalizing getting a substitute for two class periods in a single week. I also have other events and conferences that need that time and I can't shoot my entire "substitute" allotment on one week tied to a conference that may or may not be of value.
As a result, it may not be "sectarian fundamentalism" that is keeping Reformed scholars from ETS, but rather something much more mundane--the problem of busy schedules and other venues for doing scholarship that Christ the Lord of all has called us to do.