They will start seeing problems soon. Although this company is experiencing lots of computer problems, the customers have yet to find out. But their efficiency and effectiveness has been reduced significantly. And it has cost them dearly both to fix the problem and to not have it fixed in time. I hope this provides a small example of what Y2K can do.
Computers are boring and unimportant devices - until they quit working.
There are very few companies that can survive for long without their data.