Wargaming has traditionally been a niche area for plastic model companies, but with a decrease in the number of people making model kits, they have to take what business they can... note the recent forays into 1/100 plastic vehicle kits by Zvesda, clearly meant to cut into the 'Flames of War' market. 20mm used to be 'the' scale for wargaming WW2 etc, but the arrival of 15mm some time ago (80s), as model companies seemed to be failing or going to the wall, stole a lot of what business could have been capitalised on. Many wargamers don't have the patience to put together the numbers of kits required for a game and the survivability of a plastic model in the hands of your average ham-fisted gamer is quite low.
I'd like to get into larger games than the platoon sized games I currently buy for in 28mm and I constantly procrastinate between 15mm and 20mm or this. My inner child would love to go back to building 1/72 kits, especially some of the older models Airfix produced and if these appear again, along with a stream of new releases, I'll be sold on it.