Saying that any city "needs" a publicly-funded quadruple ice rink is a bit of a stretch. It may or may not be worth funding but let's not kid ourselves -- it is a different kind of spending from housing, schools, hospitals, etc.
Are they asking for any HRM money for this proposal? I wonder how many people would use the new YMCA? It seems like a facility that appeals to a much wider range of people than an ice rink. That was one of my issues with athletics back when I was in school. They seemed very competitive and targeted toward certain kids. Sports like hockey are also not cheap when it comes to equipment and facilities, whereas soccer or basketball are cheap while being equally good physical activity. These sports also probably aren't as rare compared to hockey as the disparity in public funding would suggest.