I’m honestly hoping that was just some early foreshadowing for something that won’t pay off for several seasons.
But I do expect that they’ll get there over the five season arc, which is supposed to depict events spanning the entire Second Age. Time compression aside, I have enjoyed the adaptation so far. They are already fudging things quite a bit in having Durin IV be the son of Durin III, rather than an anointed reincarnation several generations down the line as the lore describes, but I don’t mind it so much, because it allows for an equivalent story to be told in a coherent manner for the episodic tv format.
If purists had their druthers, each episode would have dozens of new characters and be set in a completely new time period, with decades or centuries passing every week. It would be an incomprehensible mess.