I don't understand why I-49 was proposed to briefly cut into the NE corner of Texas in the first place. Did they run into a lot of opposition from property owners in and near Ogden, AR to having I-49 routed near or along the existing US-71 alignment East of the Texas state line? Why not keep the I-49 route north of Texarkana entirely in Arkansas?
Just looking at the proposed path and where AR-549 currently ends at US-71, I have to wonder if Texas would have any useful exits along I-49. Maybe one at Summerhill Rd? I could understand why Texas would place funding of a Red River Bridge project for I-49 way down on its list of priorities.
This routing of I-49 through the SE corner of Texas might have made more sense if a significant road like Future I-369 were able to tie into it (and complete a loop around Texarkana). But there's a huge amount of retail development where I-369 meets I-30 and a lot of residential development North of that.
I have a feeling Arkansas DOT will, at some point years in the future, be forced to redesign the segment of I-49 between Texarkana and Ashdown to stay within Arkansas, probably on the existing US-71/59 alignment. They might have to do that to prevent another Belle Vista like situation from developing.