Weapons technology is changing, the reach of Hamas is getting longer, Hezbollah as well. World opinion is changing. Now the Fatah and Hamas have united. The status quo could remain, but conflict is inherently unstable. To say the situation has remained static for 50 years is very wrong. There were wars that Israel almost lost. Now the situation has calmed to a simmer. But it could explode at any moment.
The conflict is not inherently unstable. It has been stable for over forty years. In fact, Israel has been able to manage it with reduced manpower and a declining number of casualties. The longer range rockets are harder to conceal, surveillance technology is improving, and if all else fails Israel can ultimately reoccupy Gaza and destroy them.
The border controls can be toughened up to reduce Iran's ability to smuggle in weapons. Israel can also work on relations with Iran to isolate Hamas further and cut off supply. Improved relations with Egypt have already shut many tunnels, and tunnel detection technology itself is dramatically improving.
The apartheid vs one state notion is a false dichotomy. The harsh reality for the Palestinians is that after forty years, Israel appears to be able to manage the situation as it is today indefinitely.
The nations clamoring for sanctions are mostly declining European powers like Norway that have always been antisemitic and which are not Israel's major trading markets. Trade with Asia is growing exponentially and none of those nations show the slightest interest in "BDS".
Those who say the current situation is unsustainable have been proved wrong. And in the event change is introduced, it could be the territory returning to other Arab states, or being put fully under UN control. There is no reason to think the outcome is limited to a one or two state solution. Continuing occupation, and a no state solution are also possibly.