As nothing of interest has been found in the current search area, the Chinese location is where I'd be deploying the Bluefin next.
Fortunately, cooler, more experienced heads will be making that decision.
AF447 took almost 2 years to locate, mainly because they were searching the area at some distance from the LKP. Finally they got some of the best minds and searched near the LKP and found it in short order.
In the case of MH370, they indicated that they had two different pingers in part of the search zone if I recall correctly. That means they were darn close. These things take patience and perseverance.