If you have not read this post on Gamasutra yet, I suggest you give it a look as it basically deals with the very topic of this thread: ://gamasutra/blogs/ThomasHenshell/20140807/222732/Why_Ive_Said_Goodbye_to_Mobile_in_Favor_of_PC.php
tl;dr - the author explains why it is important to work on stuff you have a passion for, and why working on things you do not truly have a passion for (i.e. mobile development in his case) is not a good idea.