Hi Wouter,
lol yea, its little bit trick to get certificated right now. I even did not manage to get certificated for the test currency 
I think currently the only change is if you drive to Paris 
Theoretically the network could double in one month (25 days) because you need 5 certifications and everybody can do a certification each 5 days, but practically it seems to take much longer time…
Normally movements tend to have a active member rate of 10%, lets say we are very good and can reach 20%, then the network would need 125 days to double.
I see currently the biggest problem, that if you verify somebody you must trust him fully. This trust naturally takes a lot of time. Therefore I outlined here an proposal how we could speed the verification process through using different tust levels:
https://forum.duniter.org/t/cannot-sign-up-g1-with-caesium/2245/28?u=arcurus
I think this could speed up verification drastically, without compromising the security of the network.
Pros and cons of that are listed in the discussion in the topic above.