BEIJING — As China heads toward a once-a-decade change of its top leadership, its vaunted embrace a generation ago of markets and economic openness — which catapulted the country from isolated poverty to its place as a global export powerhouse — is also at a turning point.

After nearly a decade of President Hu Jintao’s focus on strengthening the state, a broad consensus of Chinese economists says the country is overdue for another big push to encourage private enterprise and to foster a shift toward a more consumer-driven economy. The challenge, they say, is turning back China’s domineering state sector.

But that seems increasingly unlikely. Publicly controlled enterprises have become increasingly lucrative, generating wealth and privileges for hundreds of thousands of Communist Party members and their families. And in a clear sign of its position, the government has moved to limit public debate on economic policy, shutting out voices for change. While political reform has always been a taboo topic in China, in economics, from the late 1970s to the early 2000s, almost anything went, with powerful voices backing strong measures that challenged the status quo. But now, despite the rise of social media, fewer prominent voices within China are able to make the case for a systemic overhaul that would prepare the nation for long-term prosperity on sturdier foundations.

“It’s not a good time to speak out for reforms, but it’s a good time to speak out against them,” said Li Shuguang, a professor at the China University of Politics and Law. “The government doesn’t encourage debate.”