I think no one is proposing a lock down until we have a vaccine. The talk is about not being back to normal until the vaccine is found, which is not the same.
Although the lock down is the most effective prevention against the spread of the virus, it is just not sustainable beyond a couple of months. Besides not being economically sustainable, it is psychologically impossible.
We are going for the 7th week of lock down in DC, and I do not think I can go much longer. Consider I am supportive of quarantines and physical distancing (I am going for my 8th week of abstinence), I live comfortably and with full connectivity, I have a job, and still despite my privileged situation and my friendliness I cannot put out anymore with the isolation.