I think a husband and wife should both have the same opportunity to reach the same level of education; however, I don't think it matters if they do not. Level of education should be a personal thing, individual to you, and not determined by your marital status.
On the other hand, when looking for a partner, some people might be attracted to those who have a similar level of education to them, or at least studied in similar areas, because it can increase shared interests.