For a long tour, I think using the bike case is a clear example of letting your stuff rule you. With the bike case you have to find a way to store it, possibly pay storage fees, leave from the same airport you arrive at or pay/arrange to ship it from one airport to another. It's just a huge loss of flexibility, just because you want to use a particular piece of equipment that you already own.
On a trip of several years, you are going to want to be really flexible, and just go where you end up going, rather than being pinned down by plans, logistics, and equipment.
My $0.02, YMMV, etc. etc., and I won't argue my point any more, just saying, you should really think about letting go of this idea.