Watch an IC set filling up at Euston, Padd, Kings X or wherever- the window/table seats will fill up far more quickly than the airline/plastics, almost always. Some minority it seems.
True, a seat with a good view is more popular than a seat with a poor view, but then a window seat is generally more popular than an aisle seat.
The question is how important a good view is. Most people travel to get from A to B, simple as that. Whilst enthusiasts are often leisure passengers, most people on trains are there because they have to be.
Would people trade a better view for a rubbish view if it meant 10% more chance of a seat? 5%? 15%? Dunno. There is a trade off though.
This applies to all modern stock though - the thing is that only certain classes get criticism for the fact that their windows and seats don't line up.