I don't think there is a chance that he will increase it. I think there is a chance he will slow it or end it. That will push up rates and help the dollar, which would be negative for silver and gold.
I myself don't think the FOMC will do anything. Ben will come out and do his dog and pony show to the delight of CNBC. He will talk for 20 minutes and say nothing. Then in a few days the major trends will resume.