Having visited Boquillas Canyon, I found this interesting.
U.S. Proposes Unmanned Border Entry With Mexico
I'm not sure what the impact will be, besides making this spot less desirable to visit. Already you can't visit the canyon without being harassed by vendors. On the other hand, it would be a pretty good spot to start the Ironbutt Border-to-Border Insanity, if it is a vehicle crossing.
Dave