The good news is that we now have email notifications when anyone
replies to a thread in which you've posted. You won't miss the
conversation that way.
If you don't want to receive these,
you can go to the top of the thread and click on "Email Subscription
Enabled" and it will disable it. If you don't want any notifications,
you can find controls for that in your profile. You can enable
individual threads in which you have an interest even after that.