No problem with the scale for me. I don't understand the MotoCycling nonsense. The cyclists pass by the scenery at the right speed, go over the tarmac at the right speed, pass the spectators at the right speed so it no way feels like you're on a motorbike.
So the only issue is the speed at which the kms are covered. Having played the game quite a bit now, I don't think I want to be cycling any more than I am now. Climbing a mountain takes a decent amount of time, and there's decent separation between the riders. Flat stages do finish quite quickly, but knowing that in advance you can still get yourself organised, it's just earlier than they would in real life.
So the distance at which you launch your sprint train and actual sprint, are not realistic, but that is the only bit of the game that's not. To fix that you'd have to change to 1:1 which is obviously not happening.
As well as the graphical cost, the way the game is currently set up with each team having set objectives, allowing lots of replayability, it wouldn't be good to change the scale.