Short sightedness in politics is already painful for all of us.
Nobody's tackling climate change, nobody's building anything fairer for younger generations, especially in places without enough housing (and what there is owned by older generations).
I won't list all the problems this would make worse, but for example, do you really want a government with only 6 months to do 2-3 extreme populist things, hoping to dredge up enough support to get a larger mandate next time?