The only way to win with such a neighbour is by war. Yes, guys. The final solution.
History indicates China, apart from moral support, has done nothing substantial.
Pakistan is in the throes of a serious internal political tussle and turmoil.
Balochistan, Northern Areas or even FATA and NWFP are not too well disposed with the present dispensation.
NATO and the US are sitting pretty on the Afghanistan border and with serious problems in Iraq, it sure wishes to clear the Aegean stables.
A war with India will allow them to have a free hand and indeed, it would be a two front conflict for Pakistan, while at the same time, they (US and NATO) will claim it is no war that they are engaged in and instead are merely engaging the Taliban! The NWFP will rise against such an 'invasion' by infidels and the Fedral govt would find it has bitten more that what it can chew!
The US India defence cooperation is also a factor that should be taken into account. The US will not intervene directly, but there are ways of assistance as Pakistan is well aware of since they have been the protège of the US for long and under that umbrella fought India.
History has not indicated that Pakistan has been able to overwhelm India in wars.
Therefore, going to war, may not solve anything, excepting adding to Pakistan's problems.
Indeed, it would be a final solution.
But for who?
Siachen is hardly worth the destruction of nations.