[tropo]

Perhaps so, but:

The new ventilators might not last. They might be banned due to low quality after the emergency passes. Some will be damaged by use. Parts might become unavailable.

New companies may enter the ventilator business. We still have the ventilator business, even if the companies change.

The demand might remain high. The disease could stick around. This isn't the first respiratory disease to start spreading right next to a Chinese biohazard lab, and likely won't be the last.

[Gibbon1]

In one news article I read that a hospital was using very old ventilators that had few bells and whistles. Because despite that they do the job.

I'd assume that ventilators produced in an emergency would be as simple as possible.