I haven't questioned the popularity of the league. I'm not blind to the packed houses or TV viewing figures, if some enjoy PSL for the entertainment value good for them. However I won't tag along with the diehards who claim PSL is the pinnacle of T20 franchise cricket, and who repeatedly boast about the bowling quality.
3 of the 5 all-time leading PSL runscorers are Kamran Akmal, Shoaib Malik and Ahmed Shehzad. All of whom have been repeatedly exposed in internationals. A pensioner like Luke Ronchi is the second leading overseas batsman (with the best SR of anyone in the top 10 !). So that doesn't speak well of both the local batting and bowling standards.
PSL doesn't compare with IPL in terms of quality of overseas players. When your leading overseas cricketers are the likes of Ben Dunk and Cameron Delport, need I say any more ? As for producing players for the national team, PSL stars have failed miserably in international cricket like Shadab Khan, Mohammad Nawaz, Asif Ali, Musa Khan and Mohammad Hasnain.
Even looking at PSL purely from a financial lens, it has failed too. How many of the franchises are actually making money ? Most of them are in the red and were begging PCB for changes to the revenue model.
If you see the QEA Trophy threads from Round 1-10, I think I posted in every single one of them. 
And what I saw was a competition with quality coverage, youngsters being promoted and selection on merit. More than can be said for the blessed PSL.
		
		
	 
I agree with what you've said, but a team was weak as Pakistan, especially going into the T20 World Cup, has to use such events as a platform for judging performances and selecting players.
You look at our team right now, and barely anyone has a guaranteed spot, except for maybe Babar Azam, Shaheen Shah Afridi, and Mohammad Hafeez. 
Everyone else has not done enough to claim a permanent spot on the team. You have a bunch of regulars with the team (ie. Shadab Khan, Haris Rauf, etc.) but the minute a player performs better than them, you'll see them being replaced or benched. 
From the standpoint of building a team, a tournament like the PSL will succeed in providing some options who are capable of playing against better bowling attacks than in the domestic tournaments and will have the same or similar expectations as international matches demand. 
Sure you'll see a bunch of hacks and technically poor players hit a few sixes and watch people demand for their inclusion in the team, but looking at Mohammad Wasim, I think that an event like the PSL could clear a lot of selection doubts from his mind right now. 
For example, if Sharjeel Khan fails miserably in the PSL, Wasim won't bother at all, and he'll instead be able to focus on a different area, perhaps a makeshift opener or someone who can be developed for the role in the 20 or so games we have before the T20 WC. That's just an example, I'm not oblivious to the fact that Rizwan is trying hard to claim that opener spot.
The point is that the downsides of the PSL are being portrayed by what the fans are adamant about, and that shouldn't be the case. It's a league that can help our young players reach a platform where they can perform.
We might not have international stars in the mix, but that was always going to happen. Given how long the IPL is, and the fact that they're adding more teams to make it longer, I don't expect international cricketers to have enough time out of their year to play both IPL and PSL. IPL is also a smart organization, they would know that they're the best league, and will try to increase the number of teams to eliminate competition, and maximize their own revenue. 
What I'm saying is that between now and the T20 World Cup, we have the PSL and 20 odd T20I games. The PSL will play a massive role in sorting the cream from the crop. Players will have expectations, and if they can't perform, they won't be in the plans for the future. 
The league hasn't started yet, so when it does, we'll have a better idea of how well we can trust the results and performances of the players.