"If I get elected, you'll never have to vote again" could mean either of two things:
- He plans to literally eliminate elections by altering our form of government. That seems unlikely to happen.
- He plans sweeping legislation, policies, and appointments that will be so difficult to roll back that they will be resilient to the outcomes of future elections. This could more plausibly succeed in practice, at least for multiple election cycles.
Either is, obviously, incompatible with democracy.