Don't think so Peter. They are too expensive and, dare I say, too"good" for the mass market. Dapol have shown that you can get a good, realistic and well painted rtr model to the market for £200 or less. I don't think the market wants more industrials, but small main line loco's that can work passenger trains as well as goods, but still fit on small layouts. I'm thinking 14xx, 57xx pannier, Jinty, J67/8/9 as 6 wheel loco's, possibly small 0-4-4 tanks but probably 2-4-2's would be easier to engineer.
I will of course repeat my suggestion of a class 22 diesel (come on Dapol, you do them in N and00, how hard can it be?), although a class 24/25 would have operated pretty much everywhere for a long period. I think there is a huge market, but it isn't my money at risk! I do wish the manufacturers the best of luck.
Ed