We'll need that sooner or later as analog input displays are bound to die out together with new consumer devices requiring them. Of all TVs listed on a popular price comparison website here, only 2/3s are listed with analog input (and analog tuners are not even mentioned any more).
My take on things (at the moment):
1. I prefer to use vintage displays with my vintage computer when I can. However, I understand that one day all of this stuff will be dead. I will be too.
2. We will probably always have the option of connecting old video sources via some kind of interface even if it isn't a feature of the TV. These devices will probably get better and cheaper as time goes on.
3. If I want perfect digital video, emulators do that for me for free.
I know many people want modern recreations of classic hardware but having grown up with these machines, I enjoy the original experience more.