Most of it seems to be down to factors which are absolutely out of his control. I missed the latest match but generally his touch / passing / movement / decision making etc have all been pretty much the same - excellent. The team as a whole plainly operates very different to how it did two years ago and Pedro getting substantially fewer opportunities to take up positions to shoot on goal seems a deliberate part of the changes. His goal scoring has still been fantastic for Spain, no?
On another note, why on earth would anyone have any problem with the way management treats him? He's worked hard for years and years for this club, he NEVER stops giving 110% on the pitch and has shown to always be willing to do whatever is asked of him to help the team, and has very regularly contributed in big ways in the more important matches, (distinctly NOT a thing of the pass - see clinical finish against PSG with progression on the line) not to mention never slacking off in the slightest during what are generally regarded as 'less important' fixtures. Literally zero attitude/behavioral problems ever and he's immensely loyal, and seems like he must be one of the easiest players in the history of professional sports for management to work with. Selling him because the team as a whole is not functioning properly would be absolutely ridiculous.
And another thing, the preferential treatment that La Masia graduates get is definitely warranted. I don't remember half so many complaints about it when it played a big role in the ridiculous success the team had under Pep. The manner in which the club brings up players through the youth teams and integrates them into what is consistently one the finest sides in the world is incredible, and one of the best things about FCB. Would anyone seriously suggest we should just abandon all that and start buying up established stars en masse, hope they'll happen to suite the system nicely and remain loyal and act right and give everything they have every time they step foot on the pitch, all the while gambling an outrageous amount of money on it, and just because for the time being we're no longer head and shoulders above every other team in Europe? Crazy!