It doesn't affect Boeing at all. Both, Airbus and Boeing are booked out for years to come. Airlines are buying those olanes, and quite frankly, passanger opinion doesn't factor into that much, if at all.
It helps Kayak so, more people booking there by selecting a certain model. And the airlines, they can easily price tickets for non-737 MAX flights higher now (they propably don't, but why not?). In the end, it is pointless: planes get swapped out all the time, so there is no guarantee dor the model to be correct. Unless you fly with an airline that has no MAX's in their fleet. In which case this whole Kayak thing is on the same level like vegan vegetables or lactose-free cheese.
It helps Kayak so, more people booking there by selecting a certain model. And the airlines, they can easily price tickets for non-737 MAX flights higher now (they propably don't, but why not?). In the end, it is pointless: planes get swapped out all the time, so there is no guarantee dor the model to be correct. Unless you fly with an airline that has no MAX's in their fleet. In which case this whole Kayak thing is on the same level like vegan vegetables or lactose-free cheese.