That's one datapoint. Frontier set the PvE challenge in the game taking into account all players - and half of players are at or below median skill. Their approach relating to greater PvE challenge has been to make it largely opt-in up to now.
Some players might be happy with such a change - I doubt that all players would be.
I find the "account for all players" in terms of difficulty to be a bit of a fallacy though, as there's plenty of space in the galaxy, mission ranks and unused variety (and potential for expansion of system states and CZ categories and the like) that could be used in turn to account for different skill levels.
The fact that, in terms of PvE difficulty, the norm for established players is to take on Elite ranked wing assassination missions. Let that sink in for a moment - they are going after the ultimate top-tier challenges that are meant for a full wing of 4 to take on. And if players can reasonably solo such a challenge, then what's left for actual wings to do?
Really, in my eyes, a regular (as in, non-wing) Elite ranked assassination mission should present a serious challenge to a highly experienced combat pilot (top 10%? Maybe top 5%?) flying a fully engineered Cutter, Anaconda or Corvette. The wing version should present a similar challenge to a wing of 4 such ships flown by skilled pilots.
Obviously, not all players would be able to complete such a mission, whether by a lack of practice or not being equipped for it. This is not a problem though, as those players could choose to simply take a lower ranked mission that is better suited to their skill level and equipment.
Similarly, by careful selection of systems that players operate in and the value of the cargo they are carrying, traders could regulate the difficulty of pirates that they encounter. Pirates killing your trade ship? Consider restricting trade routes to higher security systems and/or carrying lower value cargo. The problem here is that system security makes very little difference to the pirates you encounter, and pirate behaviour doesn't seem to be affected by what cargo you are carrying but instead simply whether you are carrying any piratable cargo.