I hope this goes better than the introduction of nutria, which Texas did to combat other invasive water weeds. They are now a major problem, causing massive erosion problems and displacing naive species. It makes me wonder what problems these weevils are going to cause in 10 years....how many native plants will they eat to extinction?

Nutria don't die off every winter, so the weevils are likely to be less of a problem. There was actually a small scale trial before they built the weevil greenhouses, which didn't uncover any major issues with them.

See https://features.texasmonthly.com/editorial/creature-green-lagoon/ for many more details including the lack of frost tolerance:

Still, their campaign faced a significant obstacle: Caddo’s unfortunate latitude. The bug, like the plant it craves, is tropical. Problem is, weevils are felled by frost, while salvinia can stand slightly lower temperatures. This has proven to be Caddo’s curse, said Julie Nachtrieb, a biologist who raises and studies salvinia weevils at the Lewisville Aquatic Ecosystem Research Facility, part of the U.S. Army Corps of Engineers. In places with mild or even nonexistent winters, weevils can be released a few times and then “you can walk away and let nature take its course,” she said. But at Caddo, the weevil populations must be reconstituted every spring, giving salvinia a running start.

The thing about unforseen consequences is they're unforseen. The probable yearly die off should limit any unwanted damages to a few seasons...assuming Texas continues to freeze every year, which is far from certain.
I really hope this solution works without issues, because they clearly need one. I just fear that these kinds of species introductions often end badly, and once done they are irreversible. It seems likely that in a few years a colony of frost tolerant weevils could evolve and quickly spread on birds.

They've been trying to breed frost tolerant weevils, but so far without much success.

Really the weevils seem like much less of a problem than the weed they're helping to control. Not all introduced species go as badly wrong as nutria or cane toads (both of which would have benefited from some small scale studies in areas they couldn't escape).

I quite agree about unforseen consequences though!

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If you can figure out how to cross pollinate with a high-THC cannabis, I GUARANTEE the "problem" will vanish literally overnight...

So, to manage an invasive species, they imported a different invasive species?

Ya, I'm waiting for the weevils to say, "fuck this Salvinia shit, this (insert cash crop here) is AWESOME!"