Unless there is another language that beats Python in terms of simplicity of toolchain, deployment and syntax, Python is not going to die. Very few people care about the performance of a language (this is same as asking whether Intel i5 or i7 is a better choice when most of what you'll be using is Microsoft Word or PowerPoint), and Python provides reasonable and handy solution to that problem as well (pypy).

Bottom line is that performance does not predict whether a language will die or live. That's not what most people care about.