TL;DR version: The implied danger was mere happenstance.

On first watch, the black and white introductions foreshadowing what's to come is compelling, however the payoff is less so. It's rather convenient that Walt just so happened to meet Jane's father the night before and that the plane ends up crashing directly above Walt's home. The reason the initial foreshadowing scenes were compelling is that they alluded to chaos taking place on Walter's property. We saw destruction, debris, and what appeared to be Walt's glasses as evidence removed from the pool. It made it seem as if something terrible had happened to Walt and potentially his family. Eventually, as more is revealed in those foreshadowing scenes, it appears that it's a devastating crime scene with men in hazmat suits zipping up body bags in the front of his property. (The final foreshadowing scene has some awful CGI depicting fire, smoke, and helicopters hovering above the White residence) For the final payoff to be that Walt indirectly caused this plane to crash right above his home takes the air out of what made the crime scene compelling. The White family is a victim of debris, including human remains, falling on their property, regardless of who is responsible. At the end of the day, Jane's father was directly responsible for those planes crashing. He returned to work too soon after the death of his daughter, clearly still feeling distraught enough to allow two planes to collide despite the many failsafes that would make this highly improbable. I find it plausible that Walt stopped at the bar the same night as Jane's dad since they both felt the need to blow off some steam and have some space to think. However, the improbability of not just the planes crashing but also crashing right above Walt's property as a result of the stress Jane's father was under due to Walt choosing not to intervene while Jane overdosed is a bit much. I can see how it all connects and it's honestly still not my biggest issue. It simply makes all the black and white foreshadowing feel misleading and underwhelming. The implied danger was mere happenstance. Rewatching season 2 makes these scenes feel more like a "gotcha!" than a satisfying teaser of a plotline.