Before they worry about that bridge, they need to get started on the section of highway running from Texarkana to Ft. Smith. And they need to get moving on the section running from Bentonville up to the border with Missouri as well. Maybe once they actually have something for that bridge to connect, then they can think about building the bridge.
For the Bella Vista section (Bentonville to the border), Missouri would have to also complete a section south to the border. Missouri had plans to do that when they proposed the 3/4-cent sales tax referendum for transportation projects in 2014. That referendum failed, so tough titties for them.