I think so. How little power some of these old dams produce is a bit shocking by modern standards. I remember the allies during WWII went to a bunch of trouble to knock out a some dams on the Ruhr. I think one of them produced 5MW of power.

So these dams produce a round error amount of energy[1]. But the effect on the watershed is not a rounding error. And a lot of them are old which brings costs due to maintenance and engineering analysis. And that applies to the 60 year old power lines to tie these to the grid.

[1] Compare with fish. Friends mom lived in Idaho which is popular with fishermen. Some state analysis showed fish tourism generates about $1000 per fish caught.