You just have to look at many of the very highend dac makers that are going back to implementing R2R Ladder Multibit conversion in their top players. Even though it's far more costly to implement, some even making their own discrete versions of it now.
Because off the shelf ones are becoming hard to get like the PCM1704K, it's still available but so costly for Burr Brown to make, compared to Delta Sigma types, 10 x the price, they will stop making it one day.
Cheers George