It will be a shame to lose the historical architecture, but Harajuku Station is ridiculously small and underequipped with ticket gates given the vast volume of passengers it serves every day, so I don't doubt this is somewhat necessary.
Still, would it have killed them to find a way to preserve if not the building itself, at least the spirit of it? This generic looking 再開発 is both boring and depressing to me. Places like 下北沢 are a shell of what they were even ten years ago.
Just the opInion of an old curmudgeon, though.