Welcome to the board dude/dudette.

I'm not so Sunshiney, and when it comes to four years from now, I'm even less optimistic than where we stand today.
I'm taking this all from baseball-reference. Four years from now, if we take four years from now to be 2018, of the guys you listed:
Strasburg: Free agent in 2017. Will want a lot of money and isn't worth too much now considering he can't play against the Braves and is pretty mediocre against the Phillies.
Gio: Also free agent in 2017. Not a huge loss any way unless he gets to "Pre-Biogensis" form.
Zimmerman: Will be under contract for two more years, but already can't play third and is a question mark at LF and 1B. Who knows how his bat will be then.
Harper: Will be a free agent after one year. Hopefully should be better, but is still a huge injury risk because of himself, has trouble with breaking stuff and hasn't proven he's dependable against lefties, though he's been pretty good this season.
Ramos: Will be a free agent that year. Injury risk on any play he has to run hard. Good bat but probably not an elite-bat unless you put in the perspective of catchers.
Zimmermann, Fister, Span, Desmond, might have all left for better or for worse. Werth will have finished the last year of his contract and probably be a shell of his former self. LaRoche has probably retired by now and that's even if he's playable.
Barring major freakups, they'll have more money to spend because of new TV deals, but that's still a lot of current players to retain that are questionably Championship players wanting big money and any holes to fill. Rendon and Roark, who have been two of our best players, will be close to free agency.
Hopefully Cole and Giolito will be able to take to the rotation, but you also have to hope Rizzo (if he's still GM) and $manager does a good job of incorporating young position players into the team and helping them become good MLB players. Based off their record so far, I'm not optimistic.
That still leaves having to fill out a bench and a bullpen.
The window is closing, and I don't think the window is as wide as we would have thought any way. They need to make good moves to continue to be a playoff threat, let alone do anything in the playoffs. Four years from now I'm just hoping we aren't being submarined to below-.500 teams.
Welcome to WNFF though. Hope you don't come to hate me and my piss-poor disposition too much.