Performance doesn't trump the connections and relationships in Pak Cricket.
So unless forced upon them, they won't take such a step.
12 years ago, similar sort of planning was going on. And it was decided by the selectors and management to get rid of all oldies and bring in the new guys in all formats under the new all format captain (Shahid Afridi).
Afridi left the test team after 1st test and the reigns were given to Salman Butt. During one toss in that wretched tour, Atherton asked Butt if he would want to bring back experienced guys like Younis and Yousaf to bolster the batting who was thin as paper on that tour. Salman Butt replied When you're building a house, it doesn't look very beautiful whilst it is under construction, but once finished, it looks brilliant. He articulated these words. Atherton was chuckling listening to Butt being firm on Pak not needing the old guys and the new ones would come good. Well, after that eventual summer was over, Azhar Ali from the new bunch was the only one to go on to achieve a good test career.
The thing I want to say is, when you have a new captain at helm with an inexperienced management, the stubborn decisions of the captain can very much lead to disaster if he isn't kept in check and his decisions aren't challenged. Babar seems quite adamant of taking these guys to Australia. It's his team and if he goes on and fail at wt20, he won't have anyone else to blame as he has been provided with every selection he was asked to.