Structural fellowships can be tricky right now. I have a couple friends in them and 1 is right up there doing the procedure and the other is still 5th guy at the table since all the established interventionalists at these institutions are trying to get numbers/training as well. The way the companies are rolling out these valves is also lending itself to institutions picking a couple established interventionalists to train and head the program... They aren't all running out to try and hire a structural fellow to bring in to start up TAVR.
There seems to be more benefit from that standpoint in peripheral... It's not like the carotid stent, renal RFA, EVAR companies, etc are going in and helping institutions create programs, so places are posting jobs looking for peripheral training explicitly ( I would say on a ratio of at least 2 or 3:1 to postings for structural trained fellows). Look on practicelink to get a sense for yourself.