No, there is never an obligation to obey a command which does harm to souls--not even if issued by a popular pope.
"Just as it is licit to resist a Pontiff who aggresses the body, it is also licit to resist one who aggresses the souls or who disturbs civil order, or, above all, one who attempts to destroy the Church. I say that it is licit to resist him by not doing what he orders and preventing his will from being executed. It is not licit, however, to judge, punish, or depose him, since these are acts proper to a superior." (St. Robert Cardinal Bellarmine, doctor of the Church; De Romano Pontifice, 2,29)
"No, there is never an obligation to obey a command which does harm to souls--not even if issued by a popular pope."
What COMMAND has your diocesan Ordinary or the current Roman Pontiff made specifically to you?
Read Vatican I and Ecclesia Dei Adflicta. Maybe instead of listening to "high ranking Vatican archbishops," Bishop Fellay should listen to the Pope and reunify with the Church. That would be TRUE obedience. He has no obligation to any "high ranking archbishop."