Yeah, that's the argument for just clinging onto Harrington, Ashcraft, and Chandler no matter what (not that you are making it necessarily).
I do think we can basically pencil in some "fine" depth via a free agent project or two on the super cheap. That's something that I and others were very critical of in the offseason, though now it looks like a much more viable plan for the ledger going forward. Still, guys like Lugo, Wacha, and Flaherty are all turning in really great seasons, so the pitching could be that much better if we had spent beyond what we spent on Perez.
In any case, this is still why I am focused on Jazz above everybody. Miami might want to pluck from that close to the majors group, but assuming it's a full-blown blowup there, they are incentivized to shoot for players who are further away from the majors and have higher ceilings in a deal.
It's not necessarily a perfect comparison, but I am reminded of the Pirates going for Peguero and Malone in the Marte trade. We currently have some guys who would fit that kind of mold in a deal to the Marlins: Plaz, De Los Santos, Polanco, Blanco, Meuth, Brazoban, Suero, Kennedy, Delgado, and Matoma are all names that come to mind and/or I plucked off the Fangraphs recent list. Age 18-20 guys who will need multiple more years of development, but presuming that the Marlins are in tank and long-term rebuild mode, that works perfectly well for them. I actually don't know that they'd have much interest in a Harrington command-over-stuff #4 type pitcher.