My premise as a critic is that most poetry written has been understudied, that there is always quite a bit more to be done. That is why I almost never run out of ideas of articles to write. (Finding the time and energy to write them is another thing entirely.) Of course, the canonical bias in literary studies means that interpetions of Milton or Calderón will pile up endlessly. Hence the false crisis of the 1970s, when English professors realized they had nothing new to say about Milton and Donne. Well of course you don't! Why not write the first book-length study on James Schuyler or Barbara Guest instead?

Lorca is overstudied, but so much of the scholarship is not that good. There are contemporary poets about whom very little has been written.