What many people seem to forget is that many travellers don't actually *want* to be at Kings Cross, or Waterloo or Paddington etc. They go there because the train doesn't actually go where they really want to be. It's all very well getting a train from Crewe and paying £70 *single* but I may well want somewhere like, say, Brent Cross or Edgware. Places like that are often easier by car - and I have the option to take other passengers too.
Well of course there are loads of variables. You might want to drive from the north to someone on the edge of south London nearer Gatwick. Do you drive through London or around?
My point was many comparisons aren't really good ones because of these variables. And sometimes it isn't down to cost. People might pay more to work/relax/drink on the train over a drive for those reasons alone.
I hate sitting in traffic or using service stations, so driving is very much a last resort for me. Sometimes it is the only way, but I'd favour rail as my first option whenever possible.
I think it might be easier in the future to have meetings scheduled to suit people travelling in from home, so many may be organised to allow off peak travel. For years I've arranged meetings to avoid the morning peak whenever possible.
I get not everyone can, but I bet a lot will.