There was a society in UCD about 6 years ago called simply The Why Go Bald? Society. Its sole objective was to get the sign re-lit. They claimed to be successful (and they might have been at the time – I do remember it having been lit up over the last few years).
The soc was subsequently disbanded, its purpose having been fulfilled – though I do think it existed in other forms as Naked Soc and Odd Soc. I also think I know one particular guy who was involved in it, who’s still around UCD, so next time I see him I’ll ask him about it & report back!