Translate the following English sentence to French:
"First, any revision of the directive would have little immediate effect on existing agreements, unless the fundamental principle of respecting the autonomy of the negotiating parties no longer applies."
D' abord, une révision de la directive aurait peu d' effet immédiat sur les accords existants, à moins que le principe fondamental de respecter l' autonomie des parties ne cesse d'être appliqué.