I have received a reply to my inquiry via customer service. It is included here to update all those concerned, and also as an attempt for some accountability/follow through. Judging from this forum, there are MANY loyal endnote users who are not satisfied with the action (or lack thereof) made my the development team. Here is an opportunity to respond to user requests and demonstrate dedication to your faithful users.
Thank you for your response. I have raised an enhancement request and forwarded it to our Development team to have an EndNote app for Kindle in the future. However, I am unable to provide you the exact time frame when this will be implemented as you might already know that the process of including a new feature should undergo various phases like designing, implementation, and testing. I really appreciate your patience in this regard.
Please respond to this email if you have any further questions and we will help you.