If no more positive tests come up between now and kickoff the game will pry be played on Sunday.
Too much money to lose with TV contracts so I doubt they shorten the season. The only bubble like scenario I could see during the regular season is for teams to isolate themselves in hotels, practice facilities, etc. and not allow them to venture away from the team (including seeing their wives and kids). Not sure if the NFLPA would agree to that although they may be forced to if this gets too out of control.