This is the opening monologue of The Cafe, Seinfeld's 24th episode.
There's always that one location, one store location that's constantly changing hands. Everybody has this in their neighborhood, it's a leather store, it's a yogurt shop, it's a pet supply. It's constantly changing and nobody can do business there. It's like some sort of Bermuda triangle of retail, you know? Stores open up and then they just disappear without a trace. Nobody knows what happened to 'em. I guess eventually when like aliens land in mother ship of close encounters, bottom will slowly open and all these store owners will come wondering out in a daze going 'I thought there would be more walk-in traffic, didn't you?'
I need help understanding the highlighted part. I've looked up all the new phrases: Close encounters, daze and walk-in traffic. But I still can't get the underlying meaning of the whole sentence.