That's too bad for junior members. I'm not one myself as everyone can see but I think the bitcointalk mods or whoever thought of this system should have taken into account that this is practically a demotion, regardless of whether they get to keep their title.

justice can't be assessed only for the benefit of a particular group. these changes have solid motives.

can you explain me what is merit please, i don't get it, what they doing with that and how we earn it

I don't think many junior members will be in the mood to see the bigger picture when they can't participate in pretty basic signature bounties like the one held by DeepOnion. Just saying 

Great job ! im glad they finally do this. Becouse of the erc-20 token airdrop mania, came many new accounts. Many off them were/are bots.
ive seen someone had like 20 accounts. I still cant undertand what "merit" exactly means.
there is a page about it https://bitcointalk.org/index.php?board=159.0
Bitcointalk needed some new rules and maybe this will bring some order in on this forum.

Is it necessary to update my signature to receive the airdrop ?
If I update my signature right now, will I be able to receive the next airdrop (considering I have done all my due diligence) ?
Will deepOnions change name one day ?
Lots of questions ^^sorry guys, I'm a noob... :/

That's misinformation. Junior members can't have links in their signatures anymore. The problem starts with bitcointalk, not the DeepOnion forum. Signatures are, indeed, broken in the sense that the links they contain aren't there anymore. As it is now, we don't know if the junior members here will have a problem with the airdrop. That's all speculation at this point. I know that the heads of DeepOnion will want to give junior members a solution about this. No one wants them to miss any airdrops.

Why would you want DeepOnion to change its name? DeepOnion got its name from The Onion Router, more known as Tor, which what DeepOnion uses to make its transactions anonymous. It's a good name, people just don't get it.

As for the airdrop, I hope you know that placing the signature is not the only rule to receive the airdrop. You can find a list of requirements here https://deeponion.org/airdrop.html

It BCT applies the merit system and indeed they got the idea from DeepOnion.  This coin will go a long way .  Why? because the ideas/features being put into the DO website and coin itself is being copied.