Google added the ability to track and graph just about anything - weight, blood pressure, sleep, but it wasn't enough. The service was just not catching on, and Google decided to nix it in 2011. The service will formally end in 2012. Users will still have until 2013 to export their data to spreadsheets or other services, like Microsoft HealthVault. You could also just print it out if you decided to go back to old school or if you discovered an issue you wanted to discuss with your doctor.
For those that never used Google Health, having a place to track the health records of yourself and your family members is actually very useful. Tracking your own symptoms enables you to better inform your care provider and get a more accurate diagnosis. Weight and exercise trackers allow you to take charge of your own health without ads for diet products to get between you and your goals. There's also the philosophical argument that your health data should remain with you, and not in some hidden file in your doctor's office.
No matter the arguments for the service, there just weren't enough users, and the world remained unchanged. Combine the lack of profits, the lack of adoption, and the privacy concerns, and Google Health was doomed.