I would have thought it was impossibly short notice to re arrange a firework display at such short notice. Far too many issues from health and safety to the actual planning of the display. The pier is such a fabulous location it's going to be difficult to find another to match it.
Personally I'd like to see Llandudno's November 5th display cancelled permanently, just have one in Colwyn Bay ( which this year is likely to be more chaotic than usual due to the promenade works) and have the Llandudno display on New Year's Eve. I would have thought that would be a big boost for local tourism and after all, do we really need to blow so much cash by having two displays so close to each other in November?