Until they solve the power requirement, which won't be anytime soon, it's most assuredly a meme. If we do get the technology, whether or not it's a meme is going to depend how much more destructive man-portable weapons have become compared to how far materials science has advanced. In general, weapons development tends to outpace armor/defense development very quickly, and while that gap has closed a bit for infantry only, nothing on a larger scale in the past couple years, chances are that trend will remain the same over time. In which case, the juice won't be worth the squeeze for power armor and it will see limited use in all but the most niche scenarios. If the trend bucks and defensive tech kept better pace with offensive tech, it might see some use in certain circumstances and with certain troops, although the expense would likely mean it's not worth it for general infantry.