Here is an interesting 2006 piece from the NYT. It looks at how tv viewing dropped off after Lance's retirement, but also makes the point that the slump in Spain and Germany was due to OP and Ullrich.
http://www.nytimes.com/2006/07/21/technology/21iht-tour.2260734.html
Some of the "facts".
65% of those who watch the Tour come from just 3 European countries.
52% of US viewers, turned off post Lance.
So, the conclusion is doping scandals effected the European fan base, while Lance effected half of a small minority, rather than globalise the sport.
The resurgence in the Sport in Europe is due to the perception that cycling has, to some extent, cleaned up it's act.
Lance's departure can only help in this department.
Belokki is unable to bring any evidence to support his and Biffins hot air argument.