Boromir's brief surrender to temptation was in fact providential as it frightened the Ringbearer into flight *just* in time for him to escape Saruman's Orcs. And Boromir's quick repentence, for which he gets much to little credit, saved Frodo from pursuit on his part.
Boromir was *meant* to be part of the Fellowship, his weakness and his strength saved the quest. There is no guarentee that Faramir, worthy as he is, could have played the same vital role. *Had* he been part of the Fellowship it is very likely they would have been surrounded in their camp, the Men, Elf and Dwarf killed and the Hobbits, including the Ringbearer, taken to Saruman.
At best they would have escaped over the river together meaning no Aragorn to rally Rohan and lead the Dead to save Minas Tirith and no Merry and Pippin to rouse the Ents. The quest might still have succeeded but with no King or anything left for him to return to.
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