You clearly dont see why this is happening. With 2.4 being aligned to a power will mean there are no consequences for killing you during PVP.
That is how it has been all the time. No change. Local bounties will still be issued as have always been. There just will be no galactic wide pilots-federation bounty in some cases. There will be a special ruleset when pvp-combat will be sanctioned by the new pf-bounty system. See link below.
There are many people aligned to a power that do not want that for obvious reasons. But they cannot however leave the power without that power hunting them down.
You can leave a power at any time without consequences. I have not read anything that this should be changed in 1.4. It only happens that NPC hunt the player if he is directly defecting to another power taking half of his merits with him. If you just leave the power there is no negative consequence what so ever.
What frontier are doing are giving people a way out with no consequence. If you have zero merits then you are not harmed in any way by being removed. You only get the benefits of not being as tasty of a kill to other players. If you want to rejoin the power, rejoin right after 2.4. Nothing will change. You already have 0 merits.
And again: players who take some pride into theire longtime pledging are harmed becouse they can no longer show off this "badge" of being pledged for a long time without interruption. The duration of pledge shows in the power tab.
It is always a pleasure to spread information. Here the link with official information of the rulechanges:
https://forums.frontier.co.uk/showthread.php/374313-PFB-Ship-Rebuy-Penalty-and-Powerplay
I hope this makes things clearer, why some people are a bit upset.
It's not game breaking - it's just another stone thrown into the glass hous of powerplay - not that we powerplayer weren't used to all kinds of ignoring, deliberate non understanding and disregarding from all kind of forum posters and Frontier too. It's just another drop that makes the barrel overflow.