Sure they can go to congress and push for increased funding or whatever for their top cases. Which gives congress a tangible budget number that could be "saved" by passing a law, but politics/congress doesn't really work this way - spending money benefits the administrating critters, the FBI, and the contractors doing the work.
Furthermore, $1M is essentially a small amount and obviously "worth it" for the major sensational events that they'd use to push through backdoors. So it seems they're actually giving up ground by having to move the argument to the urgency for backdoors in cases that aren't worth $1M.
I can see the argument playing for fiscal-primacy authoritarians who would take this as an example of government waste, but they'd already support government backdoors and I don't see this riling them up enough to be worth it.
It seems like a dead-end for propaganda purposes. What am I missing?
Maybe they're just trying to salt the earth so that their technical success in this case does not hinder them arguing for backdoors next time?