Tourism depends largely on uniqueness of culture, architecture, nature, landscape etc.
As far as Pakistan's culture is concerned it has enough novelty to inspire a visit by curious people interested in seeing and experiencing that way of life...
If Pakistan is to become another one in the line of same, then... same old same old doesn't sell.
It is a failure among others by authorities to allow disintegration of historical sites that started to decay in British era... besides, living cultures have evolution on existing... Pakistan tried to superimpose an artificial and parallel solution not native to existing paradigm. Meaning, in living cultures, historical buildings are not paying an ode to the dead. Those buildings are alive and concurrent... meaning are brought to life in their true essence to current technologies and architectural advancements. How they are kept alive is up to anyone's imagination but larger ones can find use in campuses, living quarters or resorts/shopping areas... so on and so forth. Another thing is uncontrolled expansion of existing structures by current inhabitants, that is neither in style nor in good taste... ramshackle and fleeting.
I'm surprised that first suggestion of many seems to be a competition directly with Bangkok... Bangkok found it's notoriety as a destination for very different and wrong reasons and alcohol is but a very small aspect of that... not the topic anyways.
If Pakistan tries too hard to please everyone they'd pretty quickly find themselves in a very similar situation as India finds itself today... a sore on humanity... where the purpose of travel generally is experiencing real human pain contained in the cage of caste and creed... and masses donning western refuse... while Pakistan has genuine historic credentials in clothing, cuisine and language... only it seems many too eager to relinquish for greener pastures.