When you think about it, 2017 is not a likely date. I think you're ignoring a lot of hurdles that has for the sake of hope and excitment:
- Both Star Trek and Avatar had/will have sequels with a 4+ year gap.
- Max Borenstein isn't writing the script to Godzilla 2 right now. He's working on Skull Island. Meaning he probably won't even start on a script for Godzilla 2 until 2016.
- Consider another Legendary monster movie's production schedule: Guillermo del Toro said he will be taking 9 months for pre-production. Shooting will begin in November, 2015. And then he said it will have a long year of post-production. That is roughly a 24-25 month period of making a single movie. It will be the same amount of time Edwards needs to make Godzilla 2-- Or at least a good one.
- Star Wars may be a "side story, but it will still have a substantial budget and enough clout to bring in an audience. Even if it doesn't have a full year of post-production, it will be close to that amount of time. In addition to that, Edwards will have to travel the world for various premieres and promote the new Star Wars just like he did Godzilla. That's no walk in the park. It takes a lot of time and energy. It's unlikely he'll get a lot of work done on Godzilla during that time.
- Even if Edwards didn't have to worry about touring, Star Wars post-production wouldn't end until the end of 2015/early 2016. That would give Edwards barely over a year to pull pre-production, production and post production. It's just a little over half the time del Toro has for Pacific Rim 2. Meaning Godzilla 2 would be rushed for a 2017 summer release. (No way Legendary would put a tentpole like Godzilla 2 in the fall. Wouldn't happen.) Plus, as I said, Borenstein most likely won't have a finished script until sometime in 2016.
- Legendary is already releasing Pacific Rim 2 in 2017. Two massive budget giant monster movies in one year is unlikely for Legendary as they'll want to spread their monster movies apart. Plus, if they've already announced one 2017 movie, they would have announced another by now as well.
Ugh... a wall of text. Gross...
"'Nostalgic' does not equal 'good,' and 'standards' does not equal 'elitism.'" "Being offended is inevitable. Living offended is your choice."