While being a walking, talking homing beacon for the Night King doesn't seem to offer the best odds for long-term survival, Bran's all-seeing abilities as the Three-Eyed Raven give him a unique perspective that may enable the armies of the living to get a leg up on the White Walkers. Not only does Bran possess knowledge that Daenerys, Jon, and their armies can use to effectively strategize against the armies of the dead, but he'll also be receiving his own personal protection detail to guarantee his safety.
Granted, we expect keeping Bran safe to be a taller order than anyone realises, but as Sam points out in "A Knight of the Seven Kingdoms," keeping Bran safe is about more than protecting a single person; it's about preserving the histories and memories of the world of men. When you consider Bran is the sole protector of all human history, he feels pretty safe.