No more eevee's though. The names might start getting ridiculous.
ie: Rockeon, Flyeon, Insecteon, etc. :p
Ha, I personally want an Eeveelution for all 17 elements, including Normal. As for the names, with a bit of creativity they won't sound ridiculous. Instead of Rockeon, you could use Oreon (Based off of ore), or Quareon (from quarries).
And this reminds me, a pure flying type in the future would be cool...