PSVR becomes a bit of a problem for Sony at this point. They've already stated the original PSVR headset would be supported by PS5, which necessitates a light bar on your controller for tracking. If they remove it, they'll either force PSVR users to buy additional, PSVR-compatible controllers or they'll have to keep supporting DS4s somehow. Either way, for new PSVR customers on the PS5, it would mean spending extra, increasing the entry-threshold, which is the last thing VR needs.
On the other hand, the light bar is pretty much useless outside of PSVR and is presumably the main cause for the DS4's utterly pathetic battery life. The vast majority will never play in VR so it would make sense to remove it.