Is it possible for a product to get cancelled or fail?
Makuake has a strict screening process for any products that get listed on the site, which makes it very unlikely for a product to get cancelled or fail.
Additionally, makers are responsible for shipping all pre-ordered products on Makuake Global. Unless it is the uncommon case of an “all or nothing” type which would be indicated as such in the product page, there is no minimum number of pre-orders that a product must achieve.
However, please bear in mind that there may be a instances where a product is cancelled due to unforeseen circumstances, i.e. problems with contract manufacturers or natural disasters severely affecting those involved in the creation of the product.