The Mariners are a strange case; they are in excellent shape in some of the hardest positions to fill (Hernandez and Iwakuma at the front of the rotation, and Seager and Miller make an excellent tandem on the left side of their infield). They were a freakin' disaster at all the positions on the left side of the defensive spectrum, though. I think it was somewhat miraculous that Morales turned down their qualifying offer, effectively saving themselves from themselves. I don't love Napoli in Safeco, but he would represent a huge upgrade over Smoak, offensively and defensively. They need outfielders in the worst way, especially if they give Ackley another shot at second base. This is why Ellsbury makes so much damn sense for them. Maybe Abraham Almonte turns out to be a credible center fielder, or maybe Michael Saunders finally fulfills his potential. If the Mariners believed that, though, I think they would have moved Ackley to left in place of Ibanez.
I don't know if the Mariners are ready to make the leap. If their once highly regarded position player prospects (Ackley, Saunders, Franklin) fulfill their potential like Kyle Seager did, then they could put together a pretty strong team. But that's a big if. Their offense has been *horrible* for what seems like forever, and the pipeline has run dry. Pretty much all their top prospects - and they have some great ones - are pitchers. Maybe they can trade for the help they need. It wouldn't hurt the Mariners to look into the Dodgers' outfield situation, that's for sure.
Long story short, the Mariners have some pretty great pieces and a pile of money to build a strong team. They probably should be able to do that, so long as Jack Z doesn't eff it up. I'll take the under on that one.