Il s'agit (comme souvent) d'un problème financier. Mais bien sûr qu'ils y ont pensé avant... Ci-dessous la description des fusées qui seront utilisées à Kourou (extrait du web d'Arianespace):
"Two new versions
of the Russian launcher will be used at the Spaceport: the Soyuz 2-1-a
(which was qualified during a successful flight from Russia's Plesetsk
Cosmodrome in 2004); and the Soyuz 2-1-b (which made its maiden flight
Performance of the Soyuz 2-1-a version in missions from the Spaceport
will be 2,700 kg. to geostationary transfer orbit, 1,180 kg. to medium
Earth orbit, and 4,450 kg. to Sun-synchronous orbit (inclined 98 deg.
and an altitude of 660 km.).
The Soyuz 2-1-b, which includes upgrades to its propulsion system, will
have its payload lift capability to geostationary orbit increased by
300 kg. to 3,000 kg., while the performance to medium Earth orbit is
1,579 kg., and the Sun synchronous capacity is 4,900 kg.
These versions incorporate modernized onboard systems (including a
digital flight control system with a high-speed onboard computer), and
are adapted for their use from the Spaceport with the introduction of a
new telemetry system and a ground-operated range safety system."