Well begun is half done (sarcasm)
Just imagine what fees would amount to in fiat terms if the block size remains the same (or just doesn't keep pace with the price, which could allegedly lower the fees in bitcoins) while the price rises multifold. Folks are already complaining that Bitcoin is no longer usable for micropayments due to high fees, but if the price reaches a few thousand dollars per coin (we are all hoping for that), the fees may quickly become prohibitively expensive for other payments as well. Unless you send or receive dozens of bitcoins at once, of course