if they do implement SWU, they could do it a number of ways

• Give certs to waive copays, leaving only miles as requirements
• Opposite of above (waive copays only)
• Offer a "discount" of miles and/or co-pay for a certain amount of times

The third option might work. That way people with lower fares can say "oh I can upgrade for much cheaper now" while those with higher fares can say "free upgrades!".

Of course, this will need to be able to be done through the web. And they may need to raise plat to 100k to offset program expenses.