Difficulty would rise in any way because Bitmain was always easily out of stock, so they never had problem of selling. Yeah, adding of paypal payment means new potential customers but it has nothing to do with your proposal and also everyone who buys antminer or bitmain's product is in touch with bitcoin and bitcoin payment isn't problem for them. Here is the most amazing fact: You can buy miners with 6 month zero fee loan.
Btw if anyone knows, is that 6 month zero interest available only for USA customers?