It would seem that they could take over funding The Expanse too.
At least here in Sweden it says "A Netflix Original Serier" at the start of each episode, so I'd assume Netflix is at least partially funding it already. In fact is was only very recently that I discovered that it wasn't a Netflix exclusive show in the US.
I don't know how much Netflix money goes into the production, but Netflix takes a fair number of US/Canadian series and pushes them to other markets where they otherwise wouldn't be aired or released for months or years. This certainly does help the series (Netflix is paying them), but it's paying for distribution rights which may not impact production budgets significantly.
At least here in Sweden it says "A Netflix Original Serier" at the start of each episode, so I'd assume Netflix is at least partially funding it already. In fact is was only very recently that I discovered that it wasn't a Netflix exclusive show in the US.