Like many, I wasn't a fan of GB 2016.  I'm not getting into any of the political aftermath of it, I don't assign any ill-intent to the film, but IMO it simply just was the wrong tone and completely missed everything that made the original(s) great (I love GB2, sorry).  After Ramis' passing, I had pretty much lost all hope for any sort of sequel to the originals and figured maybe it was best they left well enough alone. 
However, IF Sony is intent on continuing this franchise, it was always obvious that another entry in the original continuity would always carry the most weight and have the most opportunity to capitalize on the nostalgia that is inherent with the brand at this point.  That all to say that this surprise announcement and teaser is a pretty brilliant stroke of marketing.  If this was announced a year ago, there would be plenty of time for cynicism to kick in (and disbelief that it would actually happen), but seeing them already commit to a release for next year with an official teaser, with the son of the director of the originals in charge and saying all the right things...they have successfully activated my hype.  Like, this got me really excited. 
I will say that I kind of hope this doesn't completely go the way of a "The Force Awakens" style sequel/reboot with all the familiar beats...especially because the last GB film was already essentially a remake.  I 100% understand that this movie HAS to set up the younger cast to take over, but I'd really love it to really be "Ghostbusters 3", with the remaining cast members playing as much of a role as possible in passing the torch.  That said, even if a TFA or Jurassic World style movie is what we end up with here-- there's still a lot of potential for fun in that concept. 
There are never any guarantees with filmmaking, nevermind a comedy sequel or a 30 year later sequel to an extremely beloved franchise, but I really hope Jason Reitman is able to do his dad and the fans proud here.