Much like the other people have mentioned, if they go with the virtual queue, it would be different than RotR. Currently, with RotR, you can get in a different standby line while waiting for your BG, which makes it more like a bonus FP. If they go to a 1 on at a time approach, then it wouldn't be much different than physical standby lines, other than the need to actually stand there, so while you might still have a RD rush to get BGs, it won't be any different than current RD to get in the standby line for those rides. People aren't going to commit to not being able to get on rides, in shows, etc for the whole day, just like they'll tend to avoid standby lines that are 3+ hours. Imagine if you saw a standby line that was 10+ hours? Would you go get in that line knowing you couldn't do anything else for those 10 hours? Or would you go somewhere else? People will do the same, just virtually.
Though, personally, I doubt they'll go this way. If that level of social distancing practices are still in use, it won't be cost effective for for Disney to open the parks. The need to implement social distancing restrictions by way of virtual queues, means they'll also need to implement several other practices, like sanitizing the ride cars in-between riders. That would mean they would have to overstaff their ride CMs, to handle the extra work, as well as limit park capacity. Lower income + higher expenses means an even bigger loss for Disney they they're losing now with the parks sitting idle. At worst, the most I expect we'll see them do is paint and/or tape lines every 6 feet in the standby (and maybe FP) queues to try to encourage people to not bunch up, but with no enforcement of it.