Do most wargamers play both? I think most do. But where do their loyalties rest.
Well in my case, I'm a hard core fan of cardboard. Given a choice, I will tend to pick cardboard every time.
That said, I have a great many digital wargames. But if you look closely, my wargames are almost all attempts to render a board game on a computer. The Greats, Steel Panthers is mainly a success because it feels like Squad Leader. The more recent Second Front is again, a great success because it looks like Squad Leader. Close Combat... looks like Squad Leader. Combat Mission... looks like Squad Leader.
Perhaps you haven't played Squad Leader, but most squad tactical scale WW2 games are beholding to this board game of the 80s.
Most grand strategy games are trying to be Third Reich of World in Flames. Both board games. A great title The Operational Art of War has succeeded greatly because it looks like a big pile of board game wargames.
If you are of the sort that prefers games like Call of Duty or Battlefield, the type where you play you in a battleground like setting, it is likely you know of board game wargames, but they might not be your thing. Nothing wrong with that.
I also prefer a role game be funny shaped dice pencil and paper and friends around a table. But a lot see 'rolegame' and immediately think World of Warcraft or a similar experience.
I don't hate digital, I just didn't grow up with digital.
I don't mind reading manuals or nothing happens. But some just want to 'figure it out' while playing through a mouse.
I like knowing why everything does what it does. I like not needing a new video card to play a new board game wargame.
I have bought recent board game wargames as well as rolegames meant entirely to be play solo.
I wish they had been here sooner.
I sometimes wish I had not bought so many digital games. Even the good ones.
Steam is going to be unable to entertain anyone not using Windows 10 in under 20 days.
That is not going to be a problem for my board games.
I have this one game I like, but it will not run on a pre Windows 10 system.
That is not a problem with my recent solo wargame purchases.
And my board games will continue to run in 5 years and in 50 years. Granted, I likely won't be living in 50 years.
I don't have even an idiot grade AI to play my board games. But, they can write basic methods to do the same.
Even when the AI is not a moron, it's still not the same as playing a human. Even if I have to be both humans.
And software rarely will listen to an idea for how to house rule something.
I don't know the future of wargaming. But I do know my future

I'm the primary demographic of wargamer. My demographic created the board gaming hobby.
Will the wargaming hobby survive without me and my demographic expiring?
Remains to be seen.
But I wouldn't want to be banking too many hopes on selling board game wargames too much longer.
Or digital wargames meant to interest board game wargamers.