Rutgers Mike
Dr. Sad
Guzan is pretty solid in the EPL, although I don't think he's up to Howard's caliber at this point. We also have a bunch of young keepers in the MLS who could make the jump to a European league or become international quality. Howard could still be around in 2018, too. 39 isn't an unheard of age for goalies, too. I'm not particularly worried about our goalies at this point.
39 is pretty old for international play. Of the 96 goalies on rosters at this World Cup, only 3 were 36 or older. Buffon from Italy (36), Faryd Mondragon from Colombia (43) and Noel Valladares from Honduras (37)