This one is hardly in your control. In fact, far from it. Choosing a DB type or a database vendor is a pretty big decision and organizations typically don’t change the DB vendor at least for 5-10 years. (longer in the past)
But, with newer technologies hitting this space every year, I expect that this can possible change < 5 yrs on average.
Keep abreast of newer technologies and become involved in these decisions, if possible.
