Considering how the Retro City Rampage sequel Kickstarter comes from an indie studio (with the original owner's OK), it's possible to crowdfund the development of new games. However, lest we turn this movement into an indie game studio or ally ourselves with one, we won't ever get Konami's OK for such a project.
If Konami misses the next "game per three years" cycle (should be either end of next year or early 2015), then we can start seriously talking about crowdfunding. Until then, operate under the assumption that they're making another one in-house.
Formerly known as: Gothann