Hypothetical law change? Lorry on bike: lorry's fault. Bike on ped: bike's fault

I'm afraid I can't follow your logic as to why the factors you adduce should lead to more hit-and-runs. Pray elaborate.

Do I have to?
There will be always a group of drivers, who knowing that they are at blame by default - even if the collision is cyclist's fault - will try to escape the consequences. Especially with the "Daily Mail" mentality, that cyclists are lesser beings.
Obviously it's just a thought we should take under consideration..