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Why do you say unable? Random genetic mutations are not a choice. Adapting our environment to suit our needs seems to be working much better than natural evolution anyway.
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While it's true genetic dyversity/mutation is still happening in Humans, it's no longer constructive.
We're not becomeing better at what we do. We're just making it easier to do what we do by using technology. However, this can become very bad. We've now allowed other organisms to evolve to the point we can't cope with them (SARS and other retroviruses/antibiotic-resistant strains). Also, things like allergic reactions may be caused from our protective environment. Since we keep children away from things that are dirty/unhealthy they do not have as strong an immune system, and may react dangerously {hyper-sensitivity} to relativly safe things (like milk, dust, etc).
While I think human can still evolve, it will take a lot before it results in a "better" mutation.