Deshields and Russell will play their full three remaining years, I guarantee it. The WNBA doesn't pay a lot, and neither are on the level of a Candace Parker/Diana Taurasi/Maya Moore to command endorsements and high salaries overseas.
Not using their full eligibility would be crazy.
Russell could very well turn out to be a bust, but Deshields is a future WNBA All-Star and Olympian. She could absolutely be on the level of those other players, especially if she turns out to be the player who brings Tennessee back to national relevance....