That's stupid. Not as a goal, but Germany is never going to do this.
Not because "Germany" "doesn't want to", but because there is no space to put the rail as it is and every new attempt gets blocked by NIMBYs. We have this problem inside of the country as well. It's not like the space isn't there, it's just not going to get built because every little weak bit of resistance gets used to not build train tracks and to put more money into car infrastructure.
The result will be that you can totally go London-Berlin if you want. It's just going to take 36hours.