Yes, you could give the user the ability to update their email address on the profile page.
You will need to add an input field and bind it value to the UserEmail from the WAATKUsers record set, and you will need to update the DataAssist Update Server Behavior to include the email address and use the input field as the value.
There is a couple of things that you might want to do if you want to add this functionality:
First, send a new email if the email address is changed to the new email address so the user can verify.
Second, you might want to check the users table before changing the email to make sure that the email address does not already exists. This is important because the email address is unique.