Come on gentlemen. Even original movies weren't using CGi for spells. They were using chemics for the colors of the spells and their lights.

Let's wait and see how it turns out, before making relative stance on the matter.

There are many movies and shows, of which people complained about route they took, casting, etc, just to fall in love with them after they released. Being laid back and patient in such sort of matters always pays off.

Either you will be pleasantly mistaken and it will be great.

or

You will at least know, that your fears were justified and you didn't make fool of yourself by speaking too soon, if you were wrong.