I only did a cursory check on Steam, but it indeed still looks like a thing, with some games saying they are "sinden lightgun ready" (which seems to be the main lightgun out on the market currently)
Thanks for mentioning this! I found out about this lightgun after posting. It gets some decent reviews, though there are some threads discussing how the setup can be onerous. I also saw some games on Steam listed as "sinden lightgun ready." I'm going to research it a little more but tempted to get it.
That does sound like a lot of fun. VR has been completely off my radar, but I can definitely see your point about it being a successor. Hadn't even thought of it. What VR system do you use?