If the new PCC's do their jobs properly, they will hold the police accountable, for the first time.
If they don't do their jobs properly, they will be held accountable by the electorate.
On point 1.
PCC's have no operational control over a Police Officer/Force. So to say they will hold it accountable is utter rubbish.
So for example, PCC goes to meeting, the assembled masses (both of them) say, we want Police to deal with dog poo (I kid you not, it already happens!). PCC duly goes to see Ch.Const and says, get your chaps out cleaning up dog poo, and sticking people in the book for not picking it up.
CC tells PCC to go away, and does what he should be doing, deploys his boys & girls dealing with crime which is their responsibility (which it it's self would be a first for many years!).
Or
CC Says, yes Mr PCC, and does as he's told. Meanwhile crime goes on unabated.
Is option one realistic? Probably not, CC's will have to grow a pair.
Is option 2 realistic? Certainly is, happens already. Along with one of my 'forward' thinking Ch Supt's who years ago sent the new boys from Training down the High Street to find out what the Public wanted from their Old Bill. In an area renowned for Street Robbery, Burglary and Motor Vehicle crime, they decided parking in the High Street was the pressing issue Police should deal with.
So we did. Took area complaints months to deal with the whining from the public over that one, cause what they meant was, "I want everyone else to get a ticket, so I can park in the High Street".
On point 2.
No, the PCC is accountable to a Police and Crime Committee, aka, a Police Authority. So nothings changed, except we now have a highly paid politician where Politicians have no place to be, in Policing.
Yes, they can be voted out in an election, every 4 years, but in that time, they can do a huge amount of damage.