It wouldn't be up to Frank, HQ and ultimitely county boards would make the decision.
It's a non runner though. Even if Gaa came on board there wouldn't be enough stadia.
NZ did it with 12 Stadia. 1 of 60k, 1 of 40k, 5 of 30k and 5 of 15k-ish.
Given past form of rewarding Countries that vote for you with a few games You'd Have: Millennium, Murrayfield, Landsdowne(all 55k+) Thomond, Ravenhill(30k-ish if the latter is upgraded) an upgraded sportsground and an upgraded Dubary Park.
If the Gaa got on board (a very big if, granted) You'd easily reach the required number.