And we never did get see Bajor formally join the Federation, even though it had been accepted as a member in "Rapture".
And they could easily have inferred Bajor was a member by having Kira wear a starfleet unifrom at the end of the WYLB.
Nah, I liked the note it ended on. Things were different, but the future held great things. Glossing over Bajor's entry into the Federation... and they'd have to with all the other crap going on in that finale... would've been a disservice. Not to mention we would've missed out on some great novels.