The largest strategic threat to Ukraine's security was always Washington's willingness to keep the spigot running. Not much different from EFC and Moshiri, in some ways.
The problem isn't boredom. It's that absolutely everything in Washington has become politicized, including traditionally nonpartisan issues like national security and public health. It turns out that the fundraising maximizer is continuous doom-mongering about the other side's positions, and the media is happy to play ball because it yields inexpensive clicks. Putting politicians on TV costs zero dollars, so that ad revenue is pure profit, and the requisite talking heads are cheap when compared to traditional content. It's the same reasoning behind the reality TV boom.
Sooner or later, this was bound to happen. Funding Ukraine is the biggest no-brainer winner of a US national security policy since the CIA ran arms to the mujahideen of Afghanistan in the 1980s. The folks in Congress, however, no longer take meaningful low-hanging fruit. They do stuff like rename post offices while in session, then go back to the real business of fundraising and building name recognition via the media.