Joel Baden writes
The diachronic and the synchronic nod pleasantly to each other, and occasionally make small talk, but basically have little to say in the way of substantive conversation. (Later, each will go to its friends and badmouth the other for being so rude.) Since we are, however, all stuck in the same relatively small elevator known as biblical studies, it would be more interesting, and certainly far more pleasant, if a way were found for the two sides to have a friendly chat now and again.
His essay titled Connecting Literary-Historical and Final-Form Readings is online at Bible and Interpretation. Great stuff.