I like the idea in principle, but I don't have much interest in this army concept in particular.
What I'd prefer to see is piece-wise replacement of in-demand figures, rather than whole armies. The second-hand market will no doubt be very strong (if pricey) for several years. Plus you have Eureka providing some great niche concepts. They're probably the ones who will inherit the high-end 10mm pure fantasy market. The historical lines, of course, have always been strong and can be the backbone of a fantasy army as well. Add in a few heroes and some nice paint jobs, and that War of the Roses army suddenly can fight the War of the Ring or the War of the Five Kings.
Copplestone (for example) has a strong line of minis, right? Either get Mark to finish the line as a contract job, or (more likely, given the eyestrain that 10mm reportedly gave him) get a comparable sculptor to produce complementary minis of similar style and quality.
If we use fan financing at all, then I suggest we use it to help one or two companies like Eureka to take over the market now that GW is gone. As a fan project, we depend on one or two hobbyists to carry the whole load-- and who have to keep carrying it, over time. As a reward for one of the companies that has been with us for years, something that makes them some money at low risk and hands them a market they've always supported, we make it a profitable and low-risk move for a small company that wants our business. A company that can then support the line they produce for the long haul, over time.