I don't think the blocksize limitation was put in place to slow down adoption, however it is true that satoshi was advocating for a slow and sustainable growth in Bitcoin's early days:
Basically, bring it on. Let's encourage Wikileaks to use Bitcoins and I'm willing to face any risk or fallout from that act.
No, don't "bring it on".
The project needs to grow gradually so the software can be strengthened along the way.
I make this appeal to WikiLeaks not to try to use Bitcoin. Bitcoin is a small beta community in its infancy. You would not stand to get more than pocket change, and the heat you would bring would likely destroy us at this stage.
Incidentally satoshi disappeared not long after, leaving this as his second-to-last post:
It would have been nice to get this attention in any other context. WikiLeaks has kicked the hornet's nest, and the swarm is headed towards us.