In a decade full of movers and shakers, not every single opus managed to break free from the constraints of production. It is a natural thing that creative ideas don't make it much further than just that – an idea. With development budgets increasing year after year, the risk of starting a new IP can be costly, drastically so, to the point of the total termination of a company. The motto of the gaming industry is, and probably always will be – if it makes money then let's do it again, only this time, let's make it shinier!
Why not give respect to some of those oh-so creative ideas that never fully got fleshed out. All that we are left with is sadness, and the cold, hard fact that these games will never be, except in our hearts and minds.