How many rune pages would be recommended to have for Runes Reforged in November?

I only have 2 pages atm and it's not enough for sure but since they will rework the runes and the fact that when about to buy a rune page they haft left a note how "so you may not need as many rune pages" I don't know if I should buy one or buy Thresh which I've long wanted. I have 8400 IP. Ty
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