I don't "do" podcasts. They're too slow for me, and I can't take in information like that. As such, I've never listened to Bulbacast.
However, there are several podcast transcription services available (for a price, of course). Now, if I'm the only one who wants it, then the chance of BMG having the casts transcribed is virtually nil, but I thought I'd put the idea out there to see anyone else would like transcripts—if there's enough people, maybe it would be worthwhile.