As much as we like these names, the reality is that any name on this list is TEMPORARY until a new sponsor can be found. In that sense, the ballpark could be named almost anything (and I won't begin guessing).
- (the new) Shea Stadium (or "Shea Stadium II" in the parlance of how Wikipedia notes ballparks that seem to have moved to been rebuild, such as the Polo Grounds)
- Shea Field (because "Field" is already in the name of the ballpark's very large signs)
- Mets Field
- Sterling Field
- Jackie Robinson Field
If there's another option, let's hear it...
Update: Check out the comments section for another very good sugestion.