Using 'hir' may indeed be a neologism
1 (not necessarily a generally accepted one) but that does not mean that that is the end of it's definition. It can also be described as a:
gender-neutral pronoun
2gender-inclusive pronoun
2epicene pronoun
2androgynous pronoun
2Personally, I think it could also be called a portmanteaus
3.
My point being that despite all of these potential names, I am still not excluded from considering it a 'deliberate' bastardisation of the english language. It can be both. An unnecessary addition in my view is illegitimate and therefore a bastardisation
4.
My suggestion of using the 'singular they'
5 (in this particular instance the word 'their') as a commonly used alternative has far more validity. The use of "singular they" has been in use since at least the 15th century
2 and is is FAR more widely used and accepted.
1. Neologism
http://en.wikipedia.org/wiki/Neologism2. Gender-neutral pronoun
http://encyclopedia....tionary.com/Hir3. Portmanteau
http://en.wikipedia....ortmanteau_word4. Corruption (linguistics)
http://en.wikipedia....on_(linguistics)
5. Singular they
http://en.wikipedia....i/Singular_they