Not disagreeing with you, but I do disagree that our "best chance" is a "really good chance" of winning. We have poor odds this year, and could really have poor odds next year, depending on whether or not we can replace a LOT of positions. Right now we're losing 2 in our rotation, without prospects on the horizon who can replace them really. We're losing Adams who's been a big contributor. We're losing Bryce. We're losing bullpen pieces.
So unless there's a good argument for why 2019 will be magically different than this year with a team that on paper looks worse, then why does it matter if you have Realmuto?
Losing Bryce will become addition by subtraction. Frankly, so will Gio.
Rizzo has never struggled to find bullpen pieces. I'm not worried about that.
The bigger question is will ownership let Rizzo have a bad season, and still let him spend money. Because next year's class has a lot of promise, and isn't completely filled with early 30s players who will be washed up within a season or two.
Corbin could go a long way to replacing Gio in the rotation, and we have Joe Ross who has shown he's good enough to be a number 5 starter. Fixing catcher could be a bigger issue, but Grandal will likely be available for 12-14 million aav. So now you need to worry about replacing Murphy, which, frankly, will not be possible. So do you want to let Difo take a shot at 2nd, hoping his defense will make up for the drop off in hitting, or try and get someone else?
The point is it really wouldn't take much to have a competitive team next season, if Rizzo is allowed to control the process.