I've been at the airlines for 13+ years. I might see international widebody someday as captain. As for a 747 Captain, not very likely. It's a model who's days are numbered. My airline dumped them in the '90's. Many airlines are dumping them, so in the future, they might all be gone (by the time you can hold captain on it). The 777 & 787 (or Airbus) might be more likely. Shoot for "widebody", who cares about the model numbers. Flying is flying. If you want to fly, do it. Domestic is fine too. A 16 hour international leg to a city being attacked by terrorists is not so glamorous anymore.