Practical Turing Completeness

So many programming languages, or their implementations are written in some other language. Usually C or C++.
Worse the dev. environment often is written in a completely unrelated language.

Why is that? And what can be done about it... Yes at some point we have to give in into the status quo of device drivers, operating systems or UI libraries. But most implementations don't even go that far which makes them far less useful that they could be.

>>2
That's a chicken and the egg problem, many languages could be regarded as something more serious if they had their own code generators.