Switched to S-Corp in 2016 but did not file my quarterly 941's

We're a 2 person shareholder/employee team making around 45K Gross Adjusted Annual Income. Completely goofed on the quarterly 941's though- thought we would pay it all at tax day- so what do we do now? I see we'll have terrible penalty fees for all the months of missing the 941 deadlines. Is it possible to revert S-Corp election after the fact?