As an employer, I'd love this type of notice.
As an employee, I'd be short-circuiting my control of the situation.
The key to the conversation is that he is an employee, not a founder. This sounds like a situation where the employee is expected to act as a founder in some situations, but back down in others. Frankly, that's a bad situation in which the employee never succeeds.
While the advance-notice advice is worthy of good people, I have serious doubts about the founders for the OP's entity. I'd personally be prepared to assume that any notion of I-am-outta-here will lead to a burned bridge.
As an employer, I'd love this type of notice. As an employee, I'd be short-circuiting my control of the situation.
The key to the conversation is that he is an employee, not a founder. This sounds like a situation where the employee is expected to act as a founder in some situations, but back down in others. Frankly, that's a bad situation in which the employee never succeeds.
While the advance-notice advice is worthy of good people, I have serious doubts about the founders for the OP's entity. I'd personally be prepared to assume that any notion of I-am-outta-here will lead to a burned bridge.