I dont think it is systematic destruction. The number of Sikhs in Pakistan is very very small percentage and most of them live in the same mohallas, these gurdware on the other hand are spread all over the country which shows you how far and wide sikh communities used to live before. They are slowly opening more and more gurdware but because of the small sikh population they probably will not be able to take care of all these gurdware.
They have opened 2 more gurdware recently one was guru hargobind sahib jis gurdwara and another is guru nanak dev jis gurdwara, a few years back they reopened another gurdwara in the pashtun area in the mohalla joga singh area.
they reopened this beautiful gurdwara of guru hargobind sahib ji earlier this yr heres the opening ceremony
reopening of gurdwara in jhelum such a beautiful gurdwara built in old haveli style