Dr. Hal Scherz and Dr. Richard Armstrong of Docs4PatientCare note, "Caution to Seniors About Obamacare -- Let The Buyer Beware".
In their 5/8/2012 TownHall.com piece, they warn that ObamaCare price controls will wreak a "medical tsunami" for older Americans.
There's a separate question (not addressed in their piece) as to whether the proper policy endpoint should be to "save" Medicare as Paul Ryan and many Republicans desire, or whether to move towards a fully-private system of health coverage for the elderly (which I favor). But the current Medicare system is unsustainable, and ObamaCare will make it more so.
(Read the full text of "Caution to Seniors About Obamacare -- Let The Buyer Beware".)