Sorry, I should have been more specific. Sure there are a ton of optimistic Country songs, but this list is filled with personal optimism (a better relationship, that big fish, etc.), not a cultural optimism towards the future (the country is getting better, modern technology can be good, etc.)? I can't think of five of those (unless you bring in the afterlife, then a ton of Bluegrass). Again it's so often looking back when talking larger.
And sure we can make some generalizations. It wouldn't be a genre, even in contemporary growth, if we couldn't. Even while picking out this songs differences (if anyone agrees with me), it and the video are filled with generalizations. All the flag waving, hats, "my grandpa in WWII", etc. It's Country.
The contemporary scene is what's most interesting. The Blues roots are indeed important to all of this (and trajectory similar), but doesn't it seem in the interest of preserving a "timelessness," (even while diversifying in some aspects), the genre it's increasing looking back? You could make the same claim about Dylan, Prine, etc. too. Modern technology in most of these songs stop at the telephone and automobile still. This song leapfrogs decades forward, no? And says the next discovery could be even greater. The country and world could be better through new solutions, not solely through old values.
Anyway, I'm repeating myself, maybe off my rocker and definitely drunk, but finally I don't think anyone is kicking around Country in this thread. As far as I can tell we're all fans. Really in the end I'm not sure this is any different than when I first heard (What's So Funny 'Bout) Peace, Love, and Understanding by the other Elvis. Thought - "This a punk song?"*
* Note: I'm in no way comparing quality.