Yeah, B5 was one of those shows that took serialized storytelling to the next level, but at a time when TV networks were not interested in anything other than bottle shows. Heck, even by the time Crusade came along the airing order and time slots were all over the place. Remember when Crusade aired on Channel 4 in the UK? They put it on at like 1am in the morning..
These days it's completely different, you've got channels left right and center with all-day line ups of sci-fi programming.
I think the first show that I managed to watch from start to finish on the BBC was Farscape - even episodes I missed, I MADE sure I recorded them in advance. So it's not like it was impossible to keep up with shows back then, you just had to put a little effort in. And when it came to sci-fi, I always went the extra mile to obtain it!
The Expanse. Watch it!