Hi-rez digital, is the analog amp the bottleneck?

Interesting interview with John Siau of Benchmark Media. About 1/2 way down, is this quote:

The 32-bit systems will offer no advantage until converters reach a SNR of about 138 dB, but many other things would have to change as well. The best line-level analog circuits barely exceed 130 dB, many power amplifiers barely exceed 16-bit (96 dB) performance, and today’s best 24-bit recordings barely exceed the SNR of a 16-bit system. Most audiophile systems are limited by the SNR of the volume control circuits.

JA (Stereophile) has made similar comments in his measurements section of recent amp reviews. So what amps are people using with their hi-rez digital audio sourced systems?