I don't really empathise with some of the hand-wringing about slippery slopes in the wake of this hearing - even if the level of Pakistan's outrage at being accused was at best a bit OTT, and at worst, knowingly self-serving.
We are talking about a fairly new rule, which invites an umpire to make a decision based on prejudice. Given the same set of circumstances, it's likely that some teams will come into question, and others will not, possibly independently of the truth of the situation, and it removes any obligation to make any kind of case against an individual breaking the laws. Whereas in general, an umpire is expected to rule according to their level of certainty based on what they've witnessed, this rule asks the umpire to speculate on something they have not actually witnessed. IMO, it's a very poor rule, and this outcome only emphasises that fact.
The ICC should act appropriately, and remove the rule. At the very least, we revert back to a situation that's served up to now. If an umpire sees a player tampering or treating the ball suspiciously, they report it and we do what we always have. Or -- if they want to incorporate an in-game penalty, I'm fine with that, providing the umpire claims to have witnessed a player doing something dodgy with the ball. Should the umpire's word be enough in that situation? Surely, it should be. But it's a whole other thing to expect us to take the umpire's word on something that he can't possibly know for sure has taken place. IMO, it runs counter to how we expect umpires to make decisions in general. Umpires will always make mistakes, but they should always base their decisions on something they can see (or hear as well, in the case of some caught behinds, etc).
And beyond the obvious reason (that it's a bad rule), it's destined to be challenged in similar ways in future, so I really do think it's use beyond this point is fairly untenable. I don't think this is so much an issue of the umpire's authority being unfairly challenged so much as an example of what happens when you introduce new laws that are counter to how umpires should be making decisions in the field of play.