It’s a really poor choice of stops from what I can see. Nearly all of them are currently really hard to get to places. In the south west (where I am), Teddington, Kingston, and Sutton are all on poorly serviced train lines. I can see the logic of increasing connectivity of those places, but only if you put well connected places on the loop too. Richmond needs to be on there to give it a main line connection, district line and overground. They’ve put Heathrow on instead, but Heathrow doesn’t serve the local community as a travel hub. You don’t wander to T5 to get the tube.

Basically I have no practical public transport route to get anywhere this loop services, so I won’t use it.