Lowering the blocksize limit is nearly as dumb as raising the blocksize limit (and maybe even more dumber).
Even if a smaller blocksize limit could be preferable, there is a certain amount of risk that comes with any change, even if the change happens to be preferable.
no risk no reward.
bitcoin will fail if its unwilling to take any risks as it upgrades.
because there are 1000's of others perfectly willing to take on HUGE risks and try totally nutty things. and while most of them will fail, some won't.