Estimation of the future growth of real GDP per capita of the world
I don't think there is a consensus about this. In 1980s and 1990s, growth theorists have tried to endogeneize the technological progress in growth models, that shows a "balanced growth path" (in which economy grows at a constant rate in long distance.) So, we can say that economists don't want a decrease in GDP.

But note that there are some people who support the idea of "degrowth". You can find a definition on Wikipedia.