A national plan will only help if it's a good plan AND it's universally applicable. Oh, and it must be adjusted as we learn. We've learned that asymptomatic transmission doesn't occur. We've learned that full lockdowns don't work, but targeted quarantines might. We've learned early on that Medicare reimbursement rules required hospitals to send sick, infectious people back into nursing homes UNLESS the state acted to forbid it, as Florida did. We've got evidence of treatments working or not working, but the national planners (FDA) threaten to pull the licenses of doctors who use the drugs off-label.
No plan survives contact with the enemy, because if the plan survives, the army locked into the plan doesn't. What's needed is to distill our experience into a policies that are flexible enough to work in a wide variety of circumstances, and comprehensive enough to cover all the territories on the battlefield. The US Army has a Center for Lessons Learned. It hasn't always lived up to its name, but it has helped a lot. We need this for pandemics.
And we need elected officials more concerned with fighting the disease, using the ever-growing body of knowledge, than with enforcing their own authority by threatening religious communities and threatening ever-harder lockdowns for harmless 'violations'.