I'm pretty sure this guy recognizes that us wanting him to accept bitcoin donations isnt because of our love for Wikipedia but our desire to have bitcoin's reputation further legitimized. A flurry of activity that slows to a trickle after a month isn't going to convince him to help advertise for us for free.
I largely agree but please note that your "us" does not represent everyone here. Some have donated because they actually want to support Wikipedia. Some are not donating because they are rightly angry about Wikimedia's very anti-liberty statement (quoted above). For me, the former consideration outweighed the latter, but I can respect those in the other camp.
However, I despise the "us" you describe; those that are actually trying to manipulate Jimbo into selling out. While I'm confident that he will never be bought, A part of me hopes that he drops the idea of Bitcoin for now out of disgust for these people.
TL;DR: Bitcoiners love to buy things; Wikipedia is not something to be bought.