perhaps a more a accurate description might be Elizabeth speded up the decline.
The patrons of the last great irish harper[ Byrne] appeared to be the aristocracy,irish and english hgh society ,was opened up to him,including Queen Victoria.
Apparently there was a revival of irish harping[sometime about 1820 1840]this was led by northern prebyterians including the united irishmen.
Byrne played few public concerts BUT preferred pivate paid concerts from the gentry
in 1856 he performed publicly in Scotland and he was robbed by pick pockets of about 15 pounds[a considerable sum in those days]perhaps that influenced his decision to perform for the gentry