Campaigns are profitable and good way of earning bitcoin but it is not guaranteed that it will last a life time. But with trading, it is a good way to make bitcoins too and it depends on how you are going to be a good trader as you can make this a long term career. Still while doing some trades, you can invest into different ICO's as well.
Not joining campaigns or atleast discouraging people to do so is like not looking for a job because you don't have a guarantee that you'll be forever be an employee there or because you don't have the assurance that the company will not shut down. There's very little amount of things in this world that will last for a life time. The only thing that you can do is accept that fact and enjoy the things while they are still there. Signature campaigns are still here and it's running well, let's all enjoy it and don't be so sad just because we don't know if the mods will soon disable it.
You are right with that mate, we are just telling what will probably happen about signature campaigns. And as long as it will remain and companies are going to advertise through it then that's better. So while they are still there it's good and looking for some stable job will be the best thing to do and don't just rely with signature campaigns.