If bows aren't affected by spikes, I feel like wands shouldn't be either.
I reciprocate TheRealAskz's opinion. Spikes discourage players from whacking enemies with their wand(s) and stacking up damage early each battle.
The trade-off for realism would be balance. This suggestion would make wands more powerful than they are now, and yet, players still manage to exploit them in spite of the downgrades they received recently.
If the developers ever consider excluding wands from spikes then they must add an effect that blocks magic damage (e.g Magic Protection) and unlike dodge which can be decreased by attacking the enemy, it should last until it has used up all its turns.