They could do with one of those spacedock sized stations at the mouth to the Bajoran wormhole.
Yup one of those things next to the wormhole would have deterred the dominion
but I would imagine it would take decades to build? Would have been cool to see starfleet make a start on building it during the series and we can see it begin to take shape
The interesting thing is that if they made a new station based show today then perhaps with cheap cgi and lots of bluescreen it could have been one of the mushroom type starbases !
Or perhaps something like this
, which Doug Drexler dreamed up.