My guess on Maduro, is that he has less than 12 to 24 months left to live if he doesn't leave the country.

The average Venezuelan reported losing 24 pounds [1] of body weight just in 2017 from lack of food. The system won't survive much longer. They're at a stage of collapse where cannibalism will probably start to show up. People are flooding to Colombia and Brazil. The army will very likely remove him sooner rather than later. There's no cult loyalty system built up around Maduro as with someone like Kim Jong-Un for example.

[1] https://www.reuters.com/article/us-venezuela-food/venezuelan...