Yes, the times they are a-changing. And so does the evaluation of some wild Blackmar Diemer lines.
Take the obscure line in teh Ziegler ( aka O'kelly ) defense 1.d4 d5 2.e4 dxe4 3.Nc3 Nf6 4.f3 exf3 5.Nxf3 c6 6.Bc4 Bf5 7.g4 !! This line was suggested by IM Stefan Bucker in a famous article published in 2010 on chesscafe.com.
I have played trhis lately twice in five minute games on chess.com and both of my opponents went astray quickly. And also, the gambit has some real potency. Look at the line
7...Nxg4 8.Nh4 g6 9.Nxf5 gxf5 10.h3 Nf6 11.Bg5 e6 and now 12.d5 (diagram)
I challenge you to defend this position here as black. Not simple, is it ?
I wont go as far as saying that 7.g4 is better than 7.Bg5. I wont play it, certainly not in rated over-the-board games, but it is perfect for blitz games.
And who knows, maybe one day, the times will be changing...