If it lets you continue without making a selection than thats by far the best thing to do, have no doubt, they will take your features off and say its your fault nothing can be done. Thanks for posting that it allowed you to continue without opting for a selection this will hopefully save a lot of people headaches.
Yeah, I'm going to call them and confirm beforehand. The reason I believe it's still on there is that when you click through it gives a warning that an incompatible feature (unlimited data for prior iPhone) is being removed. As the prior messaging plan is presumably not incompatible, I'm guessing it stays put.