PSL can never be successful if they go to "stardom" route - it doesn't pay enough, there are International schedules and it can't host games in PAK with "stars". This is just the beginning - once boards start to ration on T20 leagues (participation) and E(CB)PL starts, even Dinesh Ramdhins would be ....
PSL should never go to "stardom" route, and it's not required either. If I take T20 league as an entertainment commodity, one has to analyse marketing tactics through USP (unique sales proposition) perspectives - what is triggering PSL followers? Do I watch PSL for the gana-bajana by cheerleaders - NO (AstaghfirUllah). Do I watch PSL to watch superstars of cricket in T20 - NO (I don't even watch IPL or even BPL much either). Do I watch PSL for putting money on bet - NO (NauzuBillah). Do I watch PSL for watching some big slogs - NO (Wak Thu ...). I watch PSL (whatever I watch) for 2 reasons - 1. to see new players. 2. to watch some closely contested games where the contest is between bat & ball, instead of bat & bat. And, I am sure most fans here (from IND/BD as well) watch PSL for these reasons mostly. For PAK fan, there is an added point - home city linkage.
PSL has to survive within it's scope & limitations. What IPL, PSL won't be able to hire bigger international names than even BPL - the reasons can be explained, but not needed I believe, one can check player roster. Instead of going into that route, PSl should build their own identity - that's serving the purpose of it's USP: 1. Quality contest & close fought games between bat & ball - that can only happen on good wickets and balanced teams, 2. Unveiling new talents - young PAK players who were almost unknown 3. intense City rivalry, so that the franchise brands are associated with the fans.
I can give a classic example from European soccer - BIG 6 Euro leagues are EPL, La Liga, Bundeslliga, Seria A, League 1 (France) & Premeira Liga (Portugal). In terms of financials, French & Portuguese league won't even come close to EPL, La Liga & Sera A, even Bundesliga (for Germany's strong economy & largest local market in West Europe) - and they don't every try to compete either (apart for the Qatari money launders). But, they have created their own identity - some of the best young kids play regular games in France & Portugal, even at the age of 16 (made captain at 17-18! as well), and they have created a strong bondage with soccer rich Africa (France), Latin America (Portugal) - most of their games are sold full house to African & Latin channels.
I myself keenly watch League 1, just to see new French (& African) talents .... Mbappe, Dembele, Rabiot, Martial, Coman, Pavon, Mendy, Umtiti, Varane, Pogba, Lemar ..... they were regular starters for even PSG, Monaco, Marseilles, Lyon ... from the age of 17!!!!!, which is unthinkable in EPL, or even in Spain or Italy. Even in Bundesliga, they have a monopoly of Scandinavian players - each of their game is sold in Sweden, Denmark, Poland, Finland, Norway, Holland and Baltic states of former USSR.
PSL has to identify own niche, instead to trying to flow along main stream - they don't have the muscle to counter the tide. I personally don't think PSL needs mercenaries like AB or Smith or Watson for few games in desert, unless they are willing to travel PAK. I call them mercenaries because their only motivation is money, otherwise how a player can leave his team when they are in the KO stage of the tournament !!!!! - there is absolutely no emotional bondage, neither commitment.
PSL doesn't need International big names for the sake of it (BUT, not because PAK's domestics are full of chand -sitare T20 cricketers

.... some people never learn

) - what it needs is to serve it's audience; which I don't think happening with games in desert in front of more crows than fans and with Misbah still earning a Diamond deal........