Why will/why won't Ireland win the 2015 RWC?

r/NFL have something similar during the offseason [example] (http://www.reddit.com/r/nfl/comments/38wgol/3232_why_willwhy_wont_the_green_bay_packers_win/). I thought we could start something similar.

Went with Ireland for the first topic because they're an interesting prospect.

Pretty simple: 2-3 reasons why they will win the RWC and 2-3 reasons why they won't.