Nah, we're not talking about a normal situation where the CD is made straight from the audio master without any more mastering and compression. In such a case yeah, the difference is little and might not be viable to waste all this space with the bigger files. This article is talking about a perfect scenario but there aren't that much quality CD recordings. In reality most CDs are pretty compressed and the Loudness War is still going strong. So we're not talking about a slight advantage in the dynamic range - we're talking about quite the difference.
Of course, there are also cases where the vinyls also have compressed dynamic range or are just of bad quality.
Nah: '16 bits is enough to store all we can hear, and will be enough forever.' More here: http://www.head-fi.org/t/415361/24bit-vs-16bit-the-myth-exploded.