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Upgrading to Servlet 3.0 is a great idea, especially if only the 3% user base will be impacted.
The only thing to have in consideration is that without servlet 3.1 Jenkins won't be able to use WebSockets or Server-Side Events, as both require non-blocking IO and HTTP protocol upgrade, features available from Servlet 3.1.
All the libraries that I know that promise comet-style communication for Servlet < 3.1 use long polling, or open a special port for the WebSocket connection.