Plenty of would be leaders, just as there are plenty coaches around ready to win the Super Bowl, or the NCAA national championship in football or basketball, or the World Series, etc,. etc.
Plenty of leaders with the will, be few with the will and the way. Duncan Hunter and Tom Tancredo both tried to make the immigration issue a winner in 2008, but neither was well known and dynamic enough to pull it off.
And I'd say Trump absolutely is the only one who could have done what he has done the past 15 or so months.
The right leaders to change a nation's direction are few and far between.