Granted, there were many issues that acted as kindling for the Reformation. But what does Luther say is "the article of the standing or falling church"? If a church or movement wants to align themselves with the central theological tenets of the Reformation, I don't see how they ought to be excluded on the grounds that the other issues are not central to their ethos. Who gets to decide what it means to be "Reformational"? If one cannot be "Reformational" by standing upon THE ARTICLE, then that word has lost meaning, in my opinion.
Also, as an add-on, it's not these celebrity preachers of our day who are guilty of "pluralism", but even our contemporary Reformed heroes: Pastors, who also double as seminary lecturers, traveling speakers, authors, radio hosts, ministry heads, etc. Should they not be rebuked as well for potentially failing to keep their flock and get to know their parishioners personally?