If bitcoins "stop", it will cause a mass panic of selling their bitcoins and it will plummet in price way below 0. With bitcoins out of the game, alt coins will start shinning like diamonds on the ground and a lot of people will start to find the new king of cryptocurrency.
It will cause a big problem to all people who was depending on bitcoin. If it stop jobless people will arise again and those who invested lots of money here will surely have a great loss. Bitcoin serves now as another income to everyone, means we need to adjust ourselves again to theife without it.