Only someone who has never been there would think that more people would be encouraged to drive to Blackfriars. Where would they park?
Whatever do you think people did before they cocked up the embankment and the crossing at Blackfriars with the cycle lane?! Have you ever seen the unbelievable number of cyclists who refuse to use the cycle lane because "it's not quick enough" or as one I witnessed shouting at a taxi driver after knocking off his wing mirror said, "its fucking optional, you fucking spanner"?
How do you think people who live further out are going to get their bikes into town to cycle across it? maybe we could have fewer seats on the trains so that more people could bring their bikes in from the regions?!
Encourage lovely country cycling by all means, but cities are another ballgame entirely. Walking is the best way there, wherever possible.