Fields of computer science with good academic outlook
What is hot right now doesn't actually concern you and the job market is volatile enough that in six or seven years when you enter the market it will probably be completely different. It isn't a great life choice to make decisions based on such changeable factors. 

You are better advised to study something that deeply interests you so that you are more likely to become hugely successful at it and (a) hope that the market isn't terrible when you graduate and (b) be assured that it will improve in time in any case. 

You also need to keep a bit of flexibility in mind as you study so that you can change with the times if necessary without losing your interest in things. 

So, do what you like to do and do it well. Doing what you think will give you some 'advantage' may turn out to disappoint you in too many ways to count.