If the current political system does not work, then people have the right to request for a change. The political system exists to serve the people, not the other way around. If a political system of a nation can never be changed, China would still have an Emperor now.
现有体制的合法性 -- What is your criteria to judge whether the current political system is legitmate or not? Was the Republic of China government legitmate in 1949? If it was, why Mao overthrew it? If it was not, why?
Nice. So Harper, Obama and every leader in the world can also stay in power forever because they can claim -- 这个政权还在,而且很稳定, after throwing everybody who opposes their governments to jail?