Scalar dark energy models mimicking $\Lambda$CDM with arbitrary future
  evolution
  Dark energy models with various scenarios of evolution are considered from
the viewpoint of the formalism for the equation of state. It is shown that
these models are compatible with current astronomical data. Some of the models
presented here evolve arbitrarily close to $\Lambda$CDM up to the present, but
diverge in the future into a number of different possible asymptotic states,
including asymptotic de-Sitter (pseudo-rip) evolution, little rips with
disintegration of bound structures, and various forms of finite-time future
singularities. Therefore it is impossible from observational data to determine
whether the universe will end in a future singularity or not. We demonstrate
that the models under consideration are stable for a long period of time
(billions of years) before entering a Little Rip/Pseudo-Rip induced dissolution
of bound structures or before entering a soft finite-time future singularity.
Finally, the physical consequences of Little Rip, Type II, III and Big Crush
singularities are briefly compared.
