Jimred,
Welcome to the world of honey bees.
would the hive run successfully otherwise?
You need to monitor for health of the colony. Apart from that bees have taken care of themselves perfectly adequately for the last umpteen million years.
There were no real issues - survival of the fittest, etc. etc. These days, however, with interference from Homo sapiens the problems are numerous - varroah mite, viral diseases, pesticides, habitat removal, even unsuitable strains transported around the globe, to list just a few.
The one thing they will strive for - like all of life - is to reproduce. In the case of honey bees this is increase in the number of colonies - swarming. Dependent on strain, size of enclosure, quality of weather and forage and a few other factors this could, or may not, occur on a very regular basis unless steps are taken to avoid it, if you need to.
Also, with everyone who is starting to keep bees, the advice is: run a minimum of two colonies, as when one would have died out (or does!) the beekeeper does not have to start again from scratch (well OK, one would have the equipment), or if a colony becomes weak, or has some other problem often it can be helped back to good strength with help from the other colony.
It certainly seems that TBH is a likely possibility for you, but don't decide in a rush (although a TBH may not cost more than a few quid if you build yourself) as changing hive type can be troublesome and expensive (but not imposible).
Regards, RAB