Should everyone with hepatitis C get ultrasound screenings?  

No. Only patients that have cirrhosis need regular ultrasound screening to monitor for the development of liver cancer. These screenings are usually twice a year.
No. Screening for liver cancer is only necessary in hepatitis C patients who have cirrhosis or advanced fibrosis on a liver biopsy.

Related Questions

Should people with hepatitis C get ultrasound screenings?

No. Only if they have cirrhosis. One has to have cirrhosis before they get liver cancer. However, I recommend a baseline ultrasound on all patients with hep c. This is not screening, but could pick up cirrhotic nodules or other anomalies at baseline.
Hep c. Yes. People with hep c are predisposed to getting primary liver cancer.