the "future brick" risk only applies if you try to ***k about with it, normal use isn't a risk
if all you want to do is use it "as designed" then theres no problem.
Why would anyone want to jailbreak one anyway? I can understand and sympathise with the anti-Apple "I want my computer to be unrestricted" ethos, but when you get down to it, the things work as designed. Why bother risking breaking it? For most people they work well enough "as is"