Why the requirement to reapply? I suspect it's a legalistic ploy to protect WT from liability claims.
It seems like it has to be a legal requirement. Special pioneers could be viewed as employees for certain things and just reclassifying them won't seem like a big enough split. Having them totally removed and then reapply as something else would seem like a more complete split. Plus the Society doesn't approve the pioneer application, the local body of elders does so will be a complete break.
If the people "getting the boot" were not kind and haven't made enough friends in all the time they were in special service, too bad. It isn't like this should come as a total surprise as there have been lots of bethelites reassigned and branches closed in the past. If they refuse to think it could happen to them and didn't prepare then they are not wise like the virgins Jesus spoke about in his parable.
They have a few months before they are removed so I hope they will get onto social media and try to get friends if they don't have them and create a network to take care of themselves and their peers because that is likely all they will get out of this organization.