Let tell you a story:
25 years ago a small group of riders from Colombia, South america-was underestimated by the Europeans, which according to their "standards", those "foreigners" appeared weak, almost amateur alike, and most of all, not physically & mentally prepared to race at the "European Level"....until Luis Herrera won in 1984 the queen stage of Alpe d'huez, ahead of the likes of Bernard Hinault, Laurent Fignon, Greg Lemond etc. after that day, many victories followed & those "weak" riders were finally acknowledged among the best in the world....
10 years after the successful emerging of that generation, they sadly found themselves dealing with the most devastating obstacle in the name of EPO, Doping programs & doctors, whose methods & effects opened a gap unreachable/almost impossible to close by their conventional training & riding style. they almost disappeared for an entire decade, until recent years where cycling begun to take some measures on doping...
in conclusion, they'll do fine, IF 
*Pro Cycling gets cleaner every year  
*they learn how to cope with the remaining doping aspect of the sport.  
that "European superiority" bvllsh!t in cycling only works when the dope makes the difference-otherwise anybody with the physical abilities required to race at Pro Level should do well, regardless any geographic origin/birthplace...