Yes Bill Wing has talked to the Arkansas Hwy Dept and 23 is not going to be fixed in the foreseeable future
Apparently the place that it has slide off is still totally unstable and until it stabilizes they can't even begin to repair it.
Also we need to be aware that until it drys out a bit there may be other roads that will have issues.
I agree if you have the time to take the 23/215/103 loop with a lunch stop in Oark as it's well worth the time.
Scenic/old 71 from Alma to Fayetteville isn't a bad ride if you need to make it quickly to Springdale. Use that and then at Fayetteville hop on I-49 to get around Fayetteville and into Springdale. There is a brand new (not on GPS) exit at mile marker 70 for those coming in from the south.
But yes the best alternate is to take 21 and 16. Fayetteville and Springdale are not fun towns to traverse thru but we hopefully have backroads to get past the worst of it and I-49 is your best bet if not familiar with those yet.