It's refreshing and pleasant when a client is willing to discuss things in good faith and find a reasonable solution. And it's sad that in my career it has ... never happened. I have approached clients, and clients have approached me on options for continuing projects - but the discussions have never reached a good outcome. These anecdotes to point out that yes, such options should always be on the table (if both sides can manage) but you can't rely that something like this will happen, until it happens.

I expect you value that client, and you should!