I was a big-time thumbsucker and blanket carrier until way past most parents would "allow" such a thing. Fortunately, my mom was very patient and let me give it up in my own time. (She even made me a less obvious blanket out of one of her old nightgowns to take on sleepovers with me when I got older so I wouldn't be embarrassed.
) I needed those things for some reason and she recognized that and let me be. (Btw, I have perfect teeth... I believe the thumb and pacifier = bad teeth thing has been debunked).
So, I guess my position on these things is obvious: Let them alone until the child decides to give it up. I just don't believe in forcing my preferences on my child when it's not absolutely vital.
I understand how it can be hard to see your child do something that you're not comfortable with. My kid shakes his feet when he's going to sleep. It's a comfort thing for him that was passed on from his dad. It drove me nutso when my ex did it and it drives me nutso when he does it. It's my issue, though, and it's something he apparently needs, so I grin and bear it.
You probably have outside pressure from society, as well, telling you your child is getting too big for a pacifier (or, at least, some residual pressure that you've internalized and are projecting now). Now is as good a time as any to learn to let that stuff slide right off of you.