I would argue that the agency model being pursued by some vendors jeopardises the ability for resellers to achieve that differentiation because they may have to sacrifice flexibility and agility to work within the restrictions of a vendor. For instance, there may be a contractual agreement between the vendor and the reseller that prohibits the latter from taking on competitive products. In this fast changing and challenging marketplace resellers should not relinquish control of their destinies.
If you pass the keys to a vendor you’re giving up on your ability to put in place the right solution for the customer, or to decide how you pivot in response to change. Also, by transferring customer support to a vendor resellers will waste the skills and resources they have developed over the years because these assets are no longer needed. However, those assets should be treasured because they can really help resellers stand out from the crowd.