They dragged the game down for a long time with the unbalance of the modes and solo undermining.
Some Solo/PG players may act or have acted in bad faith - but that is not the root cause of any perceived imbalance between the modes, that is mostly in the heads of those that complain about a perceived imbalance.
Where Open is concerned, making PP Open exclusive will not actually improve the popularity of Open or PP - IMO the net effect will be either neutral or negative for both. That may please some, but FD do need to adhere to their principle of all-modes-being-considered-equal otherwise they will have failed the community as a whole IMO.
Personally, I did not buy the LEP just to end up being locked out of certain content because of my gameplay mode choice. I refuse to engage in Open (
outside of a Beta) largely because of certain attitudes amongst some of the more vocal members of this gaming community, FD making features Open exclusive are not going to change that and rather than catering just for the Open only crowd they should cater for everyone.