Dragons/Bosses?

Will we ever get to see very powerful monsters such as dragons?
My idea of how this would play out is we have them as end bosses in Dungeons, however I could also see (and perhaps enjoy more) the option to have them out in the world. I could definitely see me making an entire region of (I saw another post talking about adding colored water) and fire elementals, burned down village and some ruins, At the end just have a massive red dragon. I don’t know how well this would work out but I can see it being an end game option to aspire for, or as I said we could just have them be in dungeons, and have Liches and such.