very likely, none of the npcs have gotten much new stuffSomehow I get the feeling you're missing out on the other quest lines on top of the one you mentioned.
(VERY SPOILERY)
firelink maiden - nothing since ever
lord dude - he now calls me a lord slayer, but that's about it
crestfallen guy - missing after i defeated the abyss watchers, but since he's an ex abyss watcher himself it kinda makes sense. wish there had been a bit more to his story
random lady knight - said something about us not being friends and never showed up again
shopkeeper lady - only talks about ash
andre - only talks about gems
greirat - sent him on a second looting adventure, hasn't returned yet
shady redstone dude - showed up a second time and introduced himself, missing ever since
patches - changed his line about greirat after greirat went looting, nothing else
pyromancer guy - didn't take one of the tomes i got him, he's talking about izalith ever since i gave him the carthus tome
mage guy - still wants scrolls, gave him one but didn't change his dialogue
blind lady - gave her an evil tome and she was kind of freaked out about it, but she taught me those spells nonetheless and has been hanging out there ever since
blind lady's shady escort guy - made some menacing remarks, then disappeared forever. i'm guessing he only shows up if u kill her
anri & horace - forget if they show up at firelink, but i've killed horace and got summoned by anri. dunno what's next for them
pilgrim guy - randomly dead. i only drew strength twice and i think you need 5 for his story stuff to happen, so rip
i also met siegward a couple times, hope to see more of him
lord dude - he now calls me a lord slayer, but that's about it
crestfallen guy - missing after i defeated the abyss watchers, but since he's an ex abyss watcher himself it kinda makes sense. wish there had been a bit more to his story
random lady knight - said something about us not being friends and never showed up again
shopkeeper lady - only talks about ash
andre - only talks about gems
greirat - sent him on a second looting adventure, hasn't returned yet
shady redstone dude - showed up a second time and introduced himself, missing ever since
patches - changed his line about greirat after greirat went looting, nothing else
pyromancer guy - didn't take one of the tomes i got him, he's talking about izalith ever since i gave him the carthus tome
mage guy - still wants scrolls, gave him one but didn't change his dialogue
blind lady - gave her an evil tome and she was kind of freaked out about it, but she taught me those spells nonetheless and has been hanging out there ever since
blind lady's shady escort guy - made some menacing remarks, then disappeared forever. i'm guessing he only shows up if u kill her
anri & horace - forget if they show up at firelink, but i've killed horace and got summoned by anri. dunno what's next for them
pilgrim guy - randomly dead. i only drew strength twice and i think you need 5 for his story stuff to happen, so rip
i also met siegward a couple times, hope to see more of him
so yeah, a ton of characters, but almost none of them seem to be going anywhere
not asking you to tell me anything, just sharing my experience