The show experienced a big drop in Season 2, with an average of only 456,000 and a fall of 24%.
For Season 3, overall viewership dropped by 5% and key demo viewership dropped by an alarming 12%.
The Expanse was a winner for Syfy in its first season, debuting to critical acclaim and winning an average of 581,000 viewers in the key 18-49 age demographic, with a total of 1.4 million viewers in Live+3 day calculations.
Perhaps The Expanse will fare better on a streaming service.