The current measures are not "just" to save the elderly (who deserve saving regardless of your opinion) or "just" the immunocompromised. It's to save people of all age groups and health levels. Without locking things down, hospitals will be overwhelmed and doctors will have to decide who counts as important enough to save. Women having babies may have to stay at home. Young, healthy people can and do die from this, and we need to keep the flow to the healthcare system as even and steady as possible so we don't cycle into deaths that could easily be prevented.
We don't know how long these quarantines will take, but you better believe I will not stand by and watch Trump or anyone use them to hold on to power. Americans will not let this be the status quo forever. Assuming people who are willing to set aside liberty temporarily for the protection of others are stupid sheep who won't fight for their freedom if it's necessary when the crisis is over is ridiculous.
People in China risked their lives to warm us about how dangerous this is. When the time comes for us to be back to normal life, Americans won't stand for anyone trying to curb our freedoms.