With regards to longevity of TI motor drivers, please see the below resources for more information:
TI Quality site: http://www.ti.com/support-quality/quality-policies-procedures/product-change-notification.html (please refer to the section titled ‘Semiconductor product withdrawal/discontinuance’)
TI’s General Quality Guidelines (GQG): https://www.ti.com/support-quality/quality-policies-procedures/guidelines.html (please refer to section 23)