I think "likely" may be an overstatement at this juncture. The entire Deathly Hallows insignia hardly seems like "a tiny fragment… a fraction of a line". I suppose it's possible that some ritual results in the glowy part being erased until only a small portion of the wand is left. But the word "glint" sounds like it's a metallic object moving and flashing light briefly, not something glowing with its own light continually for a time. And while it's possible that Harry will be driven to spill liters of blood to resurrect Hermione, that sounds more like a ritual for Little Hangleton than for Godric's Hollow.

It's definitely a candidate, though. It's in a graveyard, which as we all know is a great destination for bloody moonlit rituals in Harry Potter books. There is a silver line involved. Too early for "likely", but worth keeping in mind.