Its a bit of a conundrum.
Nobody is going to tour without massive security cohorts, plans, back up plans, contingency plans etc. But the mere fact these are needed will naturally put off people. Why tour a place where 10.000 soldiers and police are needed just to get you to be ground?
The biggest stumbling block is the governmental side of things. No Foreign Office in the world has Pakistan as anywhere near safe. That takes decades to change.
I think too many people are falling into the folly of, just because there arent weekly bombs like in 2009, that everything is "safe". Its obviously improved but still safe is a totally different planet from where you are now. You just had a globally reported case of a woman given a death penalty for a completely ludicrous reason that ended up being thrown out in court anyway, and the reaction was for tens of thousands of people nationwide to call for her death anyway in reaction to this. Why would people, high profile ones at that, go to a place like that? Thats not my viewpoint fwiw, but its how I imagine cricket boards and players would look at things.
Pakistan is improving but its a country where protests spur up on a seemingly monthly basis that cripple infrastructure, cities and business and forgotten about by the next day. These happened before with cricket true but in light of the 2009 incident these issues take on a darker subtext.
I hope Ireland tour and I think there's a chance of it happening provided no more terrorist attacks occur between now and any tour, but people need to be realistic and look at things rationally.