there's not much point in debating what the dead "masters" of photography would have done if they were living today, because if they were living today their collective experiences would have been different and they, more probably than not, would be different people. Do not seek validity in a medium because a certain someone used it, seek validity in a medium because it makes sense to you. Who gives a fuck if Avedon used a Rollei, or Cartier-Bresson used a Leica, or if Peter Lindbergh used Plus-X. If you think these people are great photographers because of what materials they had available, you are insulting their legacy, as well as displaying a completely inept perception of every aspect of photography.
If only I had a Super Ikonta B and a box of Portriga Rapid (with cadmium, naturally), then I could REALLY show those bastards from the 1950s what's what.
Seriously? That shit is weak.
We should take all the time that we've spent reading this mostly pointless thread and spend double that making photographs with whatever equipment is closest at hand, and not wondering if the ghost of Andre Kertesz is judging us for not using his preferred brand of film.
Smoking Gauloises to look French doesn't make you French, it just makes you look pretentious.