This flu, yes. However, the concern is that "this flu" is at a high risk of mutation into "another flu" that has a far greater mortality rate.
As to child care- most people do have short term back up plans. However- how many people have long term ones in place for the event of school closings, daycare closings, nannies that come down with a serious pandemic illness or are unable to care for ones child due to enforced quarantine etc. etc. etc. How many of us don't live near family members or those who would be home and willing to care for another child? Or who have special needs children who need special care that requires alot more than just calling that nice SAHM down the street to sit for a bit? Yes- everyone should have a backup plan- but this is quite a bit different than the sort of potential back up plans that most people have in place.