Wilson is not much. He is 28 years old, and was batting well under .200 in the majors this year. In parts of several MLB seasons, he has never shown much hitting ability, and nothing about his recent minor league career indicates he is anything more than an emergency stopgap if needed. However, the Mariners are really hurting up the middle right now, so here he is.
For now, Wilson is likely Chris Woodward's replacement in AAA. However, since Wilson is on the 40-man roster, he could get called up. I get the feeling that if Woodward does not fall flat on his face while Lopez is dealing with family matters in Venezuela, he will stay in the majors, and either Cedeno or Betancourt will go down to Tacoma. With Wilson, both could even potentially be sent down. Both Betancourt and Cedeno should be getting the message that it is time to perform. Neither Woodward nor Wilson is a true answer at shortstop, but they are both upgrades over what we have seen so far.