Very difficult for one recreational club to make the leap to professional status. There is no one size fits all. Kerry League and Mayo League have embraced representative football. The formation of a club with the support of district league clubs is a natural enough evolution. It is not the solution for others, e.g. an Athlone - Mullingar rivalry might suit in the midlands, if Mullingar had interest.
The qualifying criteria is yet to be determined. The top half capped to 5th place might suit. 5th in the FD do qualify for a playoff.
The relegated club will be relegated to the third tier! The worst case scenario for the promoted club is that they finished 10th are in a playoff the following year.
Whatever criteria currently applies for U19s. Clubs should not be hindered from joining the third tier if they meet that existing criteria. It is from there that they need to make the step up to earn a First Division licence.