If discounts on the new plans are only taken off of the data price, not the voice price, which seems to be the case then your scenario is only true for people who don't have a discount on their line.
I have the same plan you do, with a 20% discount through my employer. The discount is taken off of the $69.99 base price of the plan, which is $14. With the new plans, I'd only get the discount off the $30 data part of the plan, or $6. So even though the price of a single line is the same with either plan, I'd be paying $8 more if I switched to the My Way plan because of the lesser discount due to it only coming off the data price.
Since I have no use for unlimited minutes (unlimited nights, weekends and mobile-to-mobile covers 99% of my calls), I'll be keeping my Everything Data plan for as long as I can.