She would have won without Comey. Ultimately, Democrats might come to appreciate what he did.
Had Hillary won, with a GOP Congress, she would have gotten very little done, and Dems would have lost even more seats in the next 2 elections. Whoever ran on the GOP side would have won easily in 2020, with even bigger majorities.
Democrats have a real shot now. The chances that Trump will be a two-termer are pretty low. They can really use this as a fresh start, put Clintonism behind them once & for all, make inroads in Congress in 2 years and likely take the Presidency in 4, if they play their cards right.