Well the issue with online games is big player base means selling them post release content. If there isn't a big player base post launch, then the sales of the post release content will drop and ubisoft will still have to keep the servers running. Oh and devs still got paid for making the post release content so...
And of course, there is the chance that the players who left dont come back for the sequel cause they might have gotten bored with the first one.
PC Specs: CPU: 7800X3D || GPU: Strix 4090 || RAM: 32GB DDR5 6000 || Main SSD: WD 2TB SN850







