I don't think "demise" is the word I would choose, but there is a mountain of evidence that points to clear cash-flow problems and a gradual morphing of the religion's structure. Their model for generating cash is dying. People are increasingly consuming information online, which means they've had to significantly scale down their printing operations. This in turn means the advantages they once had given the economies of scale they were operating with have likely disappeared.
Couple that with the least educated membership of any major denomination and it's clear to see why they need to sell of properties to increase the amount of cash available to them. Literature "sales" are down and their members are not in a position to contribute lavishly.
This doesn't mean that the religion will cease to exist, but it will by necessity have to morph into something different. I think this is what we're currently seeing: selling off prime real estate, building cheaper buildings where the cost of land is cheaper, and attempting to build and online presence to sell their brand. They may be forced to relax their stand on higher education soon. They need membership to contribute more.