Some sports may come sooner than others. The ones with larger TV viewers and advertising revenue would probably start operating in empty fields while the ones that are depended on real viewers would need to wait at least till the end of the year.
The current situation would surely bring an economic depression, as in depression, the gambling could get a boost for just after they open but would be affected for year to come as people would have less money to spend on gambling.
The only indication here is for how long will the virus last, or if some organization could finally found the antidote or cure for the virus. The longer the outbreak it takes will severely affect the economic status around the globe, wether we learn to adopt until it is over or a catasthropy will befall us. If this takes longer than we expected, people will lose money for their needs, and might take longer to get back on the gambling track.