Realistically speaking, I don't think the Comey testimony is going to change anything. There's significant evidence that Russia tampered in the election, but I don't entirely buy the theory that they were in active communication with Annoying Orange's campaign. There's definitely no evidence for it, either way. People can have their own personal suspicions, but when that mingles with politics you basically just have neo-McCarthyism.
If Comey drops some bombshell that changes everything and starts impeachment proceedings, then great. Good to see Annoying Orange out as soon as possible. But I doubt it will happen.