Could've sworn that the General Attorney had stated that the rebels have to declare their assets unless they want them taken away. It's also pretty funny that you compare the referendum with Brexit and Trump, since the points you're giving are the same ones that the far-right political group are saying, Centro Democratico. Said group is starting to be so desperate that they're turning to hardcore evangelical groups to gain voters (you can see campaign ads saying that this treaty has gender ideology and we're going to turn into a "communist atheist homosexual country",
that's not a joke BTW). You can almost see the Republican party from USA in this group. It's also pretty funny the comparison since no one in the world wants Trump to win, and no one wanted Brexit, outside of those countries. Yet you see the UN praising the deals, Obama, and other leaders. (If they were so bad as the opposition says, then the so called idiot president is the smartest conman ever in the history of Colombia)
I also though I had read that the biggest point of the deal is to prevent the recurrence of more guerrilla groups, through the economical and social development of rural areas. Because, after all, these groups come from the abandonment of State in rural areas.
Sure, other groups will take over the drug business,
but it simply highlights the problems of the War on Drugs, you can't keep hitting the offer side of the business because they'll simply find desperate people to work for money and food. Thus, the peace deal with the FARC, that tackles the problem through public health promotion and other ways.
You also mention that these treaties are giving FARC more power, yet fail to acknowledge that they have to be democratically chosen, and have to pivot to the center if they want to gain said power, by forming alliances with other political parties. The five postions in both Senate and Chamber of Representatives they're given constitute less than 5% and 3% respectively of the total number of senators and representatives. Yeah, they're not doing
anything with that power. No, Colombia isn't going to turn into Venezuela because of this peace deal, and I seriously doubt the actual knowledge of politics and history from anyone who brings that talking point as an actual argument.