Straczynski has wanted to work on Doctor who for decades. He's a superfan with experience in TV science fiction. No reason he couldn't do this job.
Babylon 5 creator J. Michael Straczynski floats the idea that he should be the showrunner of the next Doctor Who iteration:
"A (relatively) quick note to respond to the (much appreciated) scores of (very nice) notes online regarding today's news about Doctor Who. My interest and record is well-established; the only real question I think the BBC would (very fairly) ask is: would British fans be open to an American showrunner, even one who is legally a resident of the UK under a visa that allows me to work for in TV/film in the UK? I think so but I doubt they'd just take my word for it, nor should they. The fan community would have to have their (polite, constructive) say."
Would this be a good or bad idea for the BBC?