Is This the end of laissez-faire?

This cannot be predicted certainly. The big crisis in 1929, laissez-faire idea had a lot of damage, but basically it still works. In 79 years, only some economic models changed, but the basic idea is still the same. So, if there will be a crisis again(we're not in a real crisis right now, this is just recession) , there will not happen certain changes too.