If you want me to treat a position like it's the last one I'll take, then show me the same: treat me like a member of the team that you'll fight to keep around. Offer equity, take that at-will clause out of the contract, treat me like a partner in your success.
Anything else is just blowing smoke, I'm afraid. At the end of the day, you can be let go without notice (and, to be fair, you can also walk away at any time); that's the agreement you sign during your first professional interaction with most US-based companies. And it sets the tone for the rest of the relationship: this is a transient arrangement, and can be discarded as situations change on either side.