So it doesn't have to hijack other threads...
Pros:
-More teams are included in the top league, which should help with income and improving standards
-You don't end up playing the same teams 4 times a season, which can get boring for fans
-The geographical spread of the Premier division will be wider, reducing the current Dublin and Friends vibe we've got at the moment
Cons:
-Fans of certain clubs think they are too good to play the likes of Sporting Fingal, and won't turn up to the games
-Playing only 30 games instead of 36 will reduce the income of the bigger clubs
-Having more clubs will dilute the money from TV and sponsorship, and the support base of some clubs
That's all that needs to be said about it!
Now an 18 team Premier, that's a different matter!