People don't even put effort in conspiracies anymore these days..some guy claiming Hitler is alive and about to start ww3..
Even if he didn't die in the 40s, and even if he had the power to pull off such a thing he'd be 127 now, it just doesn't work >_>
Entertainment is becoming a lost art.
I mean if anything, a grand child who had been groomed by neo nazis after confirming they are related would be a far more believable thing than "Oh he's still alive"
One thing I will say, if I was Hitler or his grandchild, I wouldn't try to even put myself on the map unless I had some fool-proof plan.