Twitter fans are largely not positive, from what I see.
Some of these fans are hardcore fans though and have campaigned for the show to continue for more seasons for years, so the fact that they're pessimistic about it now should tell the showrunners something. If TPTB is not willing to listen to the valid comments made, then they have to deal with the lower numbers when they come. I'm just sad to see it come to this.
I do hope that people get more enthusiastic closer to the season, hopefully the teaser and trailer will be good enough to get everyone excited again.