90% of the reason they changed the program (and name) was not because the old system didn't work well (though they did want to remove the pre-planning aspect) - but it was because they wanted to make something that looked, sounded and felt different enough from the free version so that guests couldn't complain that they are paying for something that used to be free.
No, they felt they had to change the name and design as they 'thought' people would see right through them by charging for the same thing they got for free before.
What they really messed up was the fact G+ was a worse product in every way...so it backfired. So not only were guests upset and angry over now being charged, they were now even more annoyed that the new system was worse in every single way than the previous free system.