You can have a minimal amount of AOV insufficiency and never need open heart. It all depends on how much that valve leaks and how fast it gets worse.
If you had an Echocardiogram
then they are aware of how much it leaks. If they didn't mentions valve replacement
then I would just ask to have an Echo done yearly so you stay on top of the problem.
I know that it is hard, but try not to stress
over it too much.
Nobody can predict if or when you will need surgery.
Best of luck