There is no reason as to why it couldn't try the anthology route, have a set of new characters each week or every few weeks. It might not work, but it might be different
Sure there's a reason it would be hard to go the Anthology Route.
Sets cost money, if you're changing the setting every week or so, that's an awful lot of money spent on building sets.
Also, Anthologies are hard to sell, because a network wants "bankable" characters for the audience to get attached to and tune in for
Sure, not impossible, but, considering it's already niche being Space Opera, this adds two more pretty big hurdles and the Analyses the Network does on expected return, versus investment, makes it a very hard sell indeed, as you would need to expect phenomenal ratings.