I would guess that although the passing through Moria was one of the darkest episodes of the Fellowship's journey, it also did some good; the longer way down the coast would not have led to an encounter with Fangorn and the rising of the Ents. Saruman would probably utterly destroy Rohan (leaderless, as Theoden would remain under Grima's influence) and Sauron's assault on Minas Tirith would be succesful. (no Grey Company, no Rohirrim).
Frodo and Sam would probably not be able to tame Gollum, as he would certainly not dare to approach the whole Fellowship.
Well, I think that without the mines of Moria, the quest of the Ring would soon end.
Greetings,
EfR
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