I just feel until the league as it stands is sorted out then any new teams are doomed.
The league needs to be attractive enough that if a new club came into it people in that particular area would want to go down and see their local team competing and might bring their crowds up. For example if Tralee Dynamos came into the league and were playing SD Galway then it's not exactly going to get the locals interested in going but if they were to come in and have a Munster derby against Cork or a successful limerick in an already decent league then they have a better chance of getting the ball rolling.