https://www.gamespot.com/articles/snes-classics-sells-2-million-units-worldwide/1100-6454504/

The SNES Classic is really popular. Nintendo announced today that it sold 2 million units worldwide, which is remarkable given that the $80 system only launched at the end of September. Clearly, there is demand for retro consoles, which is no surprise given how popular and in-demand the NES Classic was.

Presumably due to this incredible demand, Nintendo is re-launching the NES Classic in 2018, and Nintendo said about this, "We are hoping that consumers eager to purchase this system will wait just a short while longer."