I actually think this is a good idea but how it is implemented would need careful thought.
At the moment the start of races are basically a drag race. The front group consists of the riders who can get from 0 to 30mph the fastest. They then hold their group off the front while others have to put serious power out to try an reel them in. Same format over and over again.
So how about getting rid of the start pens where your avatar is on a static trainer. Pre-event time is rolling out on the course behind a rolling road block. Then the first 90 seconds of the race are neutral and the road block increases speed to ‘race pace’ before the flag drops.
It would be much harder for small groups to jump off the front when all riders are already doing 25-30mph and putting out high watts.