Air travel isn’t going away unless terrorists make it so unsafe that nobody would want to risk it, or government security wonks make boarding a plane so unbearable, and something else comes along that costs about the same as air travel (when you factor in the cost of your time—for instance it might be “cheaper” for a corporate executive to pay $10000 for a private jet than to pay $500 for a 48-hour ferry across the Atlantic, but a middle-class vacationer would find the ferry cheaper for their purposes).
That something could be high-speed ships like hydrofoils that can cross the Atlantic in about 48 hours. Such vehicles would be less like today’s cruise ships and more like ferries with sleeping berths (like some Japanese berth hotels) and basic ameneties like a cafeteria and a bar/lounge.
Rigid airships could make a comeback, but they’d need to use helium rather than hydrogen as the lifting gas, and travel time would still be about 24 hours to cross the Atlantic.
A rail bridge over the Bearing Straight might be doable, but I don’t think many people would want to spend a week or two (depending on how many stops it makes along the way) on board a high-speed train to get from London to New York…