I think the third-party frameworks issue can be solved with LXC / Docker. If app x requires library y and supporting utility z, this can all be put into a container without having to update the OS's versions of y and z.
Although personally I've had more instances of running into an incompatibility with the older CentOS 5 kernel than with any of the libraries in the distribution - which LXC wouldn't be able to help with.
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I think the third-party frameworks issue can be solved with LXC / Docker. If app x requires library y and supporting utility z, this can all be put into a container without having to update the OS's versions of y and z.
Although personally I've had more instances of running into an incompatibility with the older CentOS 5 kernel than with any of the libraries in the distribution - which LXC wouldn't be able to help with.