Why dont more standalone DACs come with ethernet???

The Bricasti M3 has an Ethernet renderer option that is very good. I have thought the same thing and theorized that it will slowly ‘replace’ (well, you know, maybe just in addition to) USB over the next 5 years. Ethernet doesn’t have the same level of noise issues USB can have, so why not?

DACs don't do ethernet.
Streamers do ethernet.
Ethethet and USB bi communication a 2 different things

There are definitely getting to be more available. Bel Canto e1X and Black EX DACs both have Ethernet input. Disclosure: we're a Canadian Bel Canto dealer.

Gold Note is another and there are more as well. But, still not very common at all.

Well a stand alone DAC with an Ethernet connection is called a music streamer with a DAC.

The streamer converts packetized internet signal to digital bit stream. This process if done correctly requires a high level of sophistication and a box.... is a stand alone component. The DAC then converts the digital bitstream into a line. Level analog signal that can be amplified in the analog realm. Done correctly it requires high level of sophistication and a box. They can be combined... but usually there are compromises. 

Bricasti seemed to of gotten it right though. Many have said they preferred the internal renderer option to an outboard option.