Just look around how many people had no idea about DnD ... and now they do, and they gain interest, are learning rules and after they will be done with game ... some of them might search for tabletop experience.
“Might†is the important word here. Playing a computer game and diving into the Table top would be quite a big stretch. Not unthinkable, but I don’t think it is an obvious transition. More likely that such players would start looking for experiences like BG3 and turn to the wealth of other RPGs - some WotC licences, most of them not. Or they might not - and wait for next Larian release, and refuse to touch anything else. I am doubtful that people who love BG3, love it because of D&D.
