Ok with charging at 5w? Plug your lightning-to-A cable into the little tiny cube charger they've been selling since forever.
Already have a faster USB charger? It works.
Ok with Qi at 7W? Works
Oh, you want the new shiny MagSafe puck system?
Great. Buy it.
This analysis completely ignores that the new shiny system is supposed to be a better experience. It's completely additive to what we have now, nothing has been taken away: except the included charger and earphones, neither of which I would want to have.
I expect MagSafe will be quite popular. But that's because it's cool, not because anything about the new generation of phones compels users to buy it.