I can see an argument for moving EI given that their flights from DUB and SNN arrive in Boston precleared, but I imagine in order to agree to move, they'd need to work out a deal with Massport for their lounge in E, which was renovated in the last couple of years.
In addition, during certain times of the year, the later DUB-BOS flight (4pm departure) is not precleared, and thus needs to arrive at Terminal E. This would complicate matters somewhat.