We also have Peraza and Bethacourt as valuable trading chips. Hursh adn Sims as very valuable prospects as well.
What I think would be wise to do is work on extensions first, then start looking at improving the team. Jason, Justin, Freddie, Simmons, and Gattis are 5 quality position players to build around, Julio, Minor and Wood are 3 quality starters to build around. And we have the best closer in the business. There's far worse situations to be in.
When you look at the other 3 positions. Johnson will almost certainly be better than this year, not by too much I think but still should be better. Our worst players will be gone by default as they were Uggla and Doumit, maybe someone takes over for Doumit as the super sucky bench player who gets used way more than he should. TLS over Uggla should be a giant leap. Whether you think TLS is great or not, he's for sure better than Uggla was this year, if he doesn't hit enough Gosselin can be a capable platoon half.
the key with fixing our offense is Frediot. If he's gone we're fine. Him being gone would not have resulted in Gosselin starting over TLS. TLS will for sure be the better player of the 2. TLS, Jason and Freddie at 1-3 you have 3 guys who can walk and put the ball in play. None of them K too much, they all walk healthily and Heyward this year was the "worst" linedrive hitter at 19% so we have 3 guys who should be near or over .300 hitters. Justin hits the crap out of everything. We should have a solid 1-5, then Simmons is great with the glove and should be better with the bat, if we can get someone to convince simmons to hit liners and not popouts he'll be an asset of a hitter because of his contact skills. BJ has sucked massively, but if he and CJ are our worst players and they're replacement or above replacement, I'll deal with it.
Pitching I'm admittedly more concerned with. Assuming the budget is tight, we need to basically take 3 hail marys and bring in Floyd, medlen and Beachy for incentive laden deals.