While in general I do think that other people should live by the maxim that problems should be addressed by those who see them, in this case I can see why Dr. Trueman would point out a need and not volunteer to fill it. He is trying to get the people who are engaging Rob Bell et al to tackle a project he considers more worthwhile. It probably doesn't take the intellectual resources of three seminaries to answer The Shack, whereas Ratzinger actually is a theologian.
I am sorry to see this rejoinder, because it acknowledges the general rule, but then finds an alleged exception to the rule to justify it. Moreover, it also betrays a common mindset which exists in some quarters of the church today. Here's the real question, what business is it of one Christian to be telling another Christian, "Oh dear, your energies are being wasted with respect to that issue; it's over here where the real action/need is!"
How, by what means pray tell, does one gain the ascendancy to that elevated spiritual status where one is qualified, let alone authorized, to exercise the subjective judgment of pontificating to others, unidentified at that (though one might guess the target in this instance), what they ought to be doing, when one is gifted in a particular area to engage the very subject to which one exhorts and enjoins to another? Where do we get off these days pontificating like that on internet blogs? Moreover, it wreaks, to some extent of an assumed posture, that most of us would otherwise decry, as we would a figure at the head of some personality cult. Are we in the business of passively assigning such a status to people writing blogs whom we happen to admire?
The general rules of the NT seem clear enough...
1) One responds to a need as it is recognized and according to one's ability to do so, without waiting (or hoping by way of justification to excuse one's self) for another to come along and respond to the need. (Ergo, the parable of the Good Samaritan).
2) There is, I would suggest, the latent pharisaical tendency in us which can so easily come to expression if left unmortified -
"For they bind heavy burdens, hard to bear, and lay them on men's shoulders; but they themselves will not move them with one of their fingers." (Mat 23:4).
The fact is that college kids today have become enamored with the rob bellS of the world, and we need to help them, even if they have uncritically checked their brains at the door (I happen to have two young people in my congregation off at college who while there have fallen to some extent under the spell of rob bell, and not the allurement of Romanism). Yes, there is a need to counter the claims of Romanism today, but what qualifies (for example) ME simply to lament some unaddressed need as I perceive it, and pass the buck to someone else, not to mention the implicit suggestion that other efforts to address "X" need do not measure up to one's own standard?