"couldn't" is past tense. The GP clearly expects/hopes there's a quick remedy here, and your reasoning about "can't" in the present tense (and implied continuing future tense) doesn't hold.
How about you come up with something else other than "-ism", then we'll talk (maybe).
"couldn't" is past tense. The GP clearly expects/hopes there's a quick remedy here, and your reasoning about "can't" in the present tense (and implied continuing future tense) doesn't hold.