Signs and wonders should have a place today. According to 1 Cor. 15:24-25, one of the functions of prophecy (not technically listed here as a sign/wonder, but still a supernatural event) is to convict unbelivers of their need for God. Signs and wonders serve a similar function. They are not necessarily for the believer's benefit, although they do bolster one's faith, but for the benefit of the unbeliever to draw them to God.