And perhaps the most publicized MOOC experiment, at San Jose State University, has turned into a flop. It was a partnership announced with great fanfare at a January news conference featuring Gov. Jerry Brown of California, a strong backer of online education. San Jose State and Udacity, a Silicon Valley company co-founded by a Stanford artificial-intelligence professor, Sebastian Thrun, would work together to offer three low-cost online introductory courses for college credit.

Mr. Thrun, who had been unhappy with the low completion rates in free MOOCs, hoped to increase them by hiring online mentors to help students stick with the classes. And the university, in the heart of Silicon Valley, hoped to show its leadership in online learning, and to reach more students.

But the pilot classes, of about 100 people each, failed. Despite access to the Udacity mentors, the online students last spring — including many from a charter high school in Oakland — did worse than those who took the classes on campus. In the algebra class, fewer than a quarter of the students — and only 12 percent of the high school students — earned a passing grade.

The program was suspended in July, and it is unclear when, if or how the program will resume. Neither the provost nor the president of San Jose State returned calls, and spokesmen said the university had no comment.

Whatever happens at San Jose, even the loudest critics of MOOCs do not expect them to fade away. More likely, they will morph into many different shapes: Already, San Jose State is getting good results using videos from edX, a nonprofit MOOC venture, to supplement some classroom sessions, and edX is producing videos to use in some high school Advanced Placement classes. And Coursera, the largest MOOC company, is experimenting with using its courses, along with a facilitator, in small discussion classes at some United States consulates.