Below is the response from my email sent to Toyota.
Thank you for your follow-up email.
Toyota is aware of public interest in diesel engines and more compact pickups, and we will continue to monitor market conditions to identify potential opportunities to offer our customers vehicles equipped with the features that they seek. Your email will be made available for review by the appropriate departments, and will aid us in planning future products to better serve your driving needs.
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If we can be of further assistance, please feel free to contact us at http://www.toyota.com/help/.