"Don't be to the right of Obama on Israel" isn't an unreasonable thing to ask of the Democratic nominee.
That said, as much as I loathe Hillary's stance on this issue, you do have to play the long game to some extent. There's not going to be any sea change in the US-Israel relationship within the next eight years, but it's going to get harder and harder for both the US political and American Jewish establishments to deny that Israel has no meaningful desire to end the occupation, and that probably (well, hopefully) means that AIPAC's influence will diminish.
The sea change is already happening. Obama has set the table on foreign policy with the following moves:
1. pushed U.S. oil and gas production, including fracking, to catapult the U.S. into the leading producer of fossil fuels in the world.
2. used that fact to drive down the price of oil, weakening various political rivals (Iran, Russia) and taking the wind out of the sails for overly aggressive allies (Saudi Arabia).
3. maintained a contain and stall approach towards intervention in Iran, Ukraine, etc.. Embargoed the offending parties (Russia, Iran), and then watched their financial reserves drain.
4. used that advantage to secure a reasonable nuclear nonproliferation agreement with Iran just in time to curtail Israeli saber rattling and an attempt to drag the U.S. into a conflict with Iran with a preemptive attack.
5. now we see Russia backing out of Syria just before negotiations, a clear sign that they're running out of resources to fund their campaign and that they're willing to leave Assad out to dry if needed.
The amazing thing is that the U.S. foreign policy "playbook" is a pretty set in stone doctrine that is then compounded by all of the European "free riders" wanting the U.S. to carry their water while demonizing U.S. aggression when it suits them. The entire game is rigged to put as much pressure on a POTUS to maintain the status quo as possible and Obama successfully found enough ways to circumvent those established standards to really impact foreign policy in his own meaningful way.
I think it is unfair to presume to really know exactly how Hillary Clinton would guide foreign policy herself, since foreign policy is very much built on reacting to ever-changing events and setting internal objectives that can't be shared or discussed without compromising the ability to achieve them. I have serious doubts that she is substantially more pro-Israel than Obama however, as both her and her husband were pushing for a two state solution with the Clinton Parameters.