If you can convince NCDOT and the City of Raleigh to give up the high speed ramps + a lane or two across the bridge to increase the sidewalks to a satisfactory width, install barriers, and tighten up the curb radii to reduce speeds and make crossing distances shorter -then maybe. Even then pedestrians still have to contend with on/offramp traffic.
So, as you know, all those changes basically decrease the traffic handling capacity of the interchange. Great! Less traffic, right?!
Not exactly. While doing road diets and such on arterials (sacrificing capacity in order to allocate road width to other purposes) is fantastic, and is sometimes done even at the expense of congestion (Hi, Hillsborough Street!) - it is considered a cardinal sin of traffic engineering to have a freeway offramp where queues back up past the end of the ramp onto the highway. So you’d have to be absolutely sure that whatever changes are made, don’t wind up doing that.
Also, look at what they’re doing at Blue Ridge Road. Where removing traffic lanes is not possible, it turns out it’s simpler to add an extra, dedicated bridge for bike/ped instead of widening the existing bridge to add proper bike/ped facilities. And turns out those dedicated bridges provide an overwhelmingly superior experience for pedestrians.
I would also dispute whether the “detour” notion holds water at all.
For example, somebody walking from the intersection of Six Forks & Computer Drive to Harris Teeter at NHE, the distance is actually the same. Or from Six Forks & Ramblewood to Target, it’s quite a bit shorter to use the bridge route. Basically, it’s the same distance or less if a pedestrian’s destination is within North Hills. It’s only a detour if their destination is further down Six Forks. And let’s be honest, North Hills is the overwhelmingly likely destination for any pedestrians who might be walking across the Beltline.
Also, it turns out that building dedicated, grade-separated bike/ped pathways through high-traffic, high-conflict intersections and interchanges is actually pretty common even in places like Denmark or the Netherlands. It is a misconception of American urbanists that everywhere in Netherlands is a slow-traffic, single-lane, bike-first paradise. Yes, even they have freeways and high-traffic, high-conflict areas. Check out a map of NL. Freeways, high speed roundabouts, and free-flowing ramps are EVERYWHERE.
The difference is, in their case they mostly build in the safe, protected routes for bikes and peds from the start, rather than retrofit after the fact as we’re forced to do. But I’m pretty sure an engineer from the Netherlands wouldn’t look at an interchange between a highway like the beltline and an arterial like Six Forks and think “Let’s make it look like downtown Utrecht” - they would just put in a separate bridge.