Orchestral strikes are always poignant. Musicians are a bit like miners: they stick together. It's their job to stick together.
Plus it's hard for orchestral management to organise scab labour. If an orchestra's on strike and the employer brings in alternative musicians – assuming such people are available and willing to break a strike, undermining the striking musicians who may be friends and colleagues – audiences don't like it. They paid to listen to Orchestra X, not Orchestra Y, while Orchestra X demonstrates on the street outside the hall.
Here's wishing the Detroit musicians good luck. Let's hope they can get round a table with the employer and negotiate a decent settlement.