While Expedia has been on a growth spurt given all of its acquisitions over the past year, Priceline has been saying that its "competitive moat" is wide but under-appreciated. A Priceline acquisition of TripAdvisor would make a bold statement and widen that competitive moat for all to see.
It's has to be a comeuppance for Expedia to see its offspring, TripAdvisor, turn into such a formidable frenemy. On the other hand, Expedia shareholders made plenty of money off the TripAdvisor spinoff and are laughing all the way to the bank.