Something new this year in Parsippany. All players must use the scoresheets provided. No scorebooks allowed. Steve Doyle said there was a problem in the past with one or more players referring to old games in their scorebook to refresh their memory, etc.
Of course I dug out my scorebook before I left home this morning. On a side note, my round one opponent, a teenager, asked if I was sure it was really 5 seconds delay and not 10.
Never dull here.
I think all players should be required to provide and use DGT boards. 
Good for them. I’ve become convinced this is best practice, not only for this reason, but for various hide-the-scoresheet shenanigans.
At least three times per tournament I run:
“Do you see Bill Goichberg here? No? OK then.”
At most major tournaments like this, there is usually a vendor selling books, equipment, and score books. Some score books are pretty simple flip style with room for 40 to 100 games. Other scorebooks have a nice leather cover with an index page to note opponents, venue, and opening. Is the vendor going to compensated for loss of sales?
The organizers only responsibility to any equipment vendor they secure is to provide them with visible space, secure space and announce that an equipment vendor is there.
Of course I’ve also stopped using equipment vendors because I supply board, sets, and clocks which make up for a large portion of the revenues from an equipment vendor. I’m rarely seeing books being bought anymore regardless because players realize they can get the same book on Amazon for much less.
No.
Is this heralding the demise of the hard cover scorebook?
There are 2 recent problems for TDs mentioned in this thread, not having the game score shown at all times and now the ability to look back at previous games for opening advise. And this latest is really a form of notes being referred to during a game.
One of the main reasons to have a hard cover scorebook is to have a permanent record of one’s games. This is a paper database isn’t it? In today’s pgn and database world no one would be allowed to have access to their personal game database during a game on a computer, tablet or phone.
There is a rule in US Chess that the score sheet is the property of the TD or organizer, and if they provide a scoresheet it must be used. And usually there is a NCR form where the person keeps the copy and turns in the original to the TD or organizer. There really is no reason why someone cannot then just copy the game from the loose scoresheet into their book after the game, away from the playing area.