If one were to answer whether it is possible to have a sustainable society with 7 billion humans living at generally higher standards of living than today, one must think of what such a society would look like.
First, all energy must somehow be supplied by the sun, thus eliminating both fossil fuels and nuclear. Some quite large solar farms and algae plants will be required, but I would say it is possible.
Then comes the bigger challenges such as agriculture. There is nothing sustainable with the current methods used to feed the world, erosion, soil depletion, pesticides and artificial fertilizing are all parts of the problem. On top of that comes the sheer size of land required to grow food for 7 billion of us, and I see no other solution than vertical farming, which may in it self be possible, but terribly expensive with current technologies (or would it?). Keeping up the supplies of meat and fish in a sustainable way wouldn't be any easier , perhaps in it self impossible (again that is with current technologies).
And how about construction and mining. Use of concrete surely has to be abandoned as construction grade sand in a non-renewable resource which is already becoming hard to access, and I don't know of any technology that would allow us to recycle this material properly. Biodegradable materials such as hay and wood can to some extent be used, but that would again require quite some effort to gather in the first place, hardly sustainable in a "7 billion+ world". In fact, traditional mining of any recourse is a non-sustainable activity, so in a sustainable world any metal or commodity that we would be dependant upon must be 100% recyclable.
Again I cannot see how further economic growth is todays world can be sustainable, degrowth, less consumption and less use of resources has to be the only options, though it might just be me misinterpreting the terms. If I were to be really mean though, I would say that the term "sustainable growth" is in the first place utter rubbish, growth can obviously not be sustained for more that a limited period of time.