That’s Camping’s problem.
Some of his followers will give up on God, thinking everything is a hoax. But many will still believe in Camping. He will anounce a new revelation/calculation and his followers will eagerly accept this and forget his old predictions. You see, when people have invested in a false idea, it is hard for some to admit that they were fooled. So they will loudly proclaim whatever Camping’s next prediction becomes.
There is this mindset with millennial cults. They think they have God’s secrets all figured out because they are so smart and spiritual. The cult leader tells his followers they are special because they follow him and they know God’s secrets. You are an insider, you are not only one of the elect - you are one of the elite! Some people eat this up.
What happens to these weak minded people on May 22nd?
With history as a guide, some might go back to normal churches, many will bail out entirely, some will believe a recalibrated model and soldier on.
Campingite signs I've seen pictures of say "it begins May 21, 2011". They've got an out.
I’m pulling for April 6th, the anniversity of His trip to Golgotha and the Cross! see my previous comment above. Get ready folks, it won’t be long.