I always fought short of clipping my queens for if they swarm then you lose half of any disease in the hive ,, Nortmally the state of the hive after a swarming is such that it will spring back to massive honey and bee with a vengence due to the queen laying her own body weight in eggs each day (plus I couldn't be bothered as I had fifty hives ).
Leaving a declining queen in place will see the effort steadily reduce the size of the hive till the point is reached where the queen cells are raised .
So I usually grew two cut off frames of queens in a neuc box filled with a couple of cups full of workers . They simply make queen cells along the cut where there are eggs so long as the egggs are three day old or younger.
Then I re queened with the new queens a day after after snuffing out the old queens , introducing the new queen in a queen transporting block .
If it is never allowed to swarm what will nature do to the hive disease wise
?? I've not come across any research on this matter but it does seem sensible to let nature take the upperhand in a hive for most of the time.
The ring of wood with the spikes and woven mesh on top is called strangley enough, " A queen marking cage "