The most important contributions of linguistic ecology to our understanding of contact between ‘majority’ and ‘minority/minoritized’ language groups are the result of the broad, dynamic perspective that the ecosystemic view can give. Research should focus on the application of the principle of ‘subsidiarity’ in the field of linguistic communication (a more ‘global’ language should not do anything a ‘local’ language can do). From this approach, a sustainable contact will be that which does not produce linguistic use in allochthonous language at a speed and/or pressure so high as to make impossible the stable continuity of the autochthonous languages of human groups.