[citation][nom]hydac7[/nom]When will this Celeron thing end[/citation]
Probably never because low-end CPUs are becoming powerful enough to handle most everyday computing tasks so people who need little more than browsing the net, watch stuff on Youtube/Netflix, etc. have little use for more than that.
When my mother went shopping for a light-use laptop, I made her buy one based on an AMD E-350 since even that is still overkill for everything I expect her to ever do with it. She's quite happy she didn't spend the extra $200 for the 'better' laptop she now knows she didn't need.
Different people and uses have different requirements. In some cases, those can be very low.