Actually, there is absolutely another option. The Mariners could, for lack of a better term, stay the course. GM Jerry Dipoto can go out and continue to find value on the trade market, and slowly raise the floor of the team for 2019.
However, there is one other option that almost nobody is considering: a soft rebuild. So what the heck is a soft rebuild? Before we answer that, we should define a rebuild so you can distinguish the difference. A full rebuild would require trading almost every valuable piece between now and the end of 2019. This includes Edwin Diaz, Mitch Haniger, James Paxton, etc.