SMH. Think the protesters might be a little too short sighted on a few things.
From what I understand, they've caused the current people in charge (in HK) to take the whole deal off the table, and there's no sign of changes to be implemented later either, as per "the wishes" of the people (who just want it "gone"), it seems like it's completely off, possibly for good whilst the current lot of people are in. And that's probably the worst thing that could have happened.
Instead of clamouring to have changes that would protect HK people better into the Law on this Extradition deal (keep the deal, but definitely make it better to protect themselves ahead), all they've done is make it another lot of peoples problems later when they step into power. And when that happens, it'll be further into the 50 years of "One Country, Two Systems", so the people who have power have less incentive or even reason (approval by HK people) to give in and give greater powers to protecting HK citizens, especially favourable ones. And by that point, they'll be able to offer two deals, neither any good; One Bad, One REALLY bad. And the HK people won't have a choice at that point but to accept basically the deal they've rejected now (if not a worse off version), or get the heck out of there (which few want to, because of some strange ideals; differing ones depending on generation you're from).
At least with "something" akin to protections being baked into Law, International condemnation of breaking that Law may give a bit more pause for concern from China if they want to continue having the dough rolling in.