It is a better fit if they have no aspirations to become NCAA champions again, do not want more national exposure for the school and the hockey program, and do not want to attract the best possible student atheletes in North America. Playing against Ivy league schools does nothing for RPI compared to playing against BU, BC, Notre Dame, Maine, etc, as far as attracting recruits and exposure to its university. I really cannot think of one good reason to stay in the ECAC if Hockey East wants them. You could play Union, Clarkson, Cornell in non league and probably rekindle the Christmas tournament with attractive schools willing to participate. Stability with the conference tournament always in the same site which happens to be in a major hockey hub. If this was a chess club maybe the ECAC would be a better fit but not if they want to be a factor as a Division 1 hockey program.