No, those unlimited data plans were getting out of hand for activities other than voice or SMS replacement. Think Netflix, Pandora, streaming maps for GPS apps etc. I doubt anybody hit 5-10GB in a month by using Skype.Haven't you just proved the point, people have 'cut the cord' as far as phone calls/texts go and are now simply using data for all their needs and the providers have responded by tiering and throttling data to extract maximum $$$!
VOIP and text apps, along with light browsing, will not make you exceed the lowest data tier, which is the same price as the initial plans. If you used to be a 600 min voice + text plan + data user, you can get still save money by pulling back on voice minutes and dropping your text plan, and shift such communications needs onto your data portion. Carriers are still ahead, because people who used to be just voice customers now also want cellular data to do things that they could not do before, in addition to shifting into VOIP or Whatsapp.