Oh I cannot predict the future ~ if I could I wouldn't be in the bloody country today.
I do know that the original proposal was to limit the waiving of double jeopardy to only three crimes but the Government of the day allowed it to be greatly widened so you may well be right in suggesting that this is a pretty thick "thin end of the wedge" and we have probably opened a door that will be very hard to close.
On the same track I personally still have doubts that the right verdict has been reached even now but then I was not in court and have not seen/heard all the evidence. To me there is more than a touch of trying to shut the Daily Mail up about the whole thing together with the Met trying, perhaps too hard, to prove they are no longer racist. I do suspect that this is not the end of the matter and that campaigns to prove their innocence will now commence and run side by side with others, on both sides, seeking compo will run for years. My only prediction is that this is not the last we will hear of the whole sorry saga.
A good sort out of the Criminal Justice system in the UK is necessary but don't hold your breath..... there will, no doubt, be much more tinkering at the edges but no real rationalisation of the law or sentencing for many years yet.
