I'm all for this. As I frequent IRC all the time. It would be a good way to connect, and its not like the chat will be restricted to the motovlog topic. Most channels I hang on just do various banter most of the time. I can look into how things work with Freenode and see how the channel can be built up and maintained.
The main obstacle is usually people not staying around, getting impatient if times are slow and when no-one frequents it enough. So some on-site advertising might be usefull.
As for the spam question, no, it won't be overly spammed. Main channel I hang on, which is also on Freenode doesn't get any spambots. Besides, when people go "who even use IRC anymore", spambots won't be much of a focus from ill-doers.
@Hypertard, channel works fine, but you need to make sure you see when something is going on in there. (my client flashes the taskbar icon on activity).