The possibility of this happening is very low, sorry but that's my opinion, transforming the players puts them in a lot of risk already and they are not essential people at this time so they can't find an exemption to this. It's been stated int the post above that business that will require gathering of people will be suspended under the GCQ, so that's it, they are looking for an exemption and they need some approval but the government is more focus on more important things now.
The government has no time for this, so it's not likely for the PBA to resume under their initiative, you are right, they need some approval doing this as this would not only risk their health but the health of the people as well, and if the government were able to close the ABS CBN at this covid-19 crisis, there's no way the will give some special treatment to any business, we have a different government now that they want to implement the law properly.
Games and sports comes under least discussion when it comes to lift the bans on businesses. Since there is a lot of public gathering is involved, no sports can be opened now and Philippine Basketball Association also have to wait until the situation become very much corona free. I think that we can see PBA to resume once the vaccine is developed for covid-19.
Many people though's that on e ECQ lifted they can live back to normal and do what they normally do in daily life but if we do a reality check we will really find tge danger still there since as you said there's no vaccine has been created and yet so if this gatherings will happen for sure a huge risk not only with PBA but also in the whole country is at risk.