No, it's not, because people. I really don't see a future where anyone gives up civil aviation for the climate. More likely a combination of electrification, biofuel, and hydrogen will be the solution.
It's already happening with TEN-T on the continent. Even though slower, travel by train in generally city centre to city centre and much less hassle, so where feasible can supplant aviation.
Speed is somewhat irrelevant here as what matters is how many ships per day they can process.