We'll at the rate they are going -- 3-episodes per release and a release every 3 months (WIAB-July, WIAB:SE-October, DYCA-January, LBTROTR-April) -- it would take 32 releases and 8-years (until July 2012) to relelase all the episodes of the show. Being HIT only has the rights until April 2009, all the episodes won't get out the way they are doing it. At their rate about 58% of the episodes (under 60) will get out (that is if they keep continuing the DVD patterns as it is now without slowing down, or stoping it) by the time the contract runs out. Not to mention the cost --(if all episodes were released this way) it would cost around $480
Even with Season box sets, if they don't make up their minds to decide to make them soon they won't have enough time to make all 5 season box sets (a set of that size usally take 4-6 months to produce). If by late 2006 they haven't started work on season box sets they probally won't be able to do it sucessfully (unless they renew/extend the contract with Henson). As of now, HIT has no plans for season sets, and unless we convince them otherwise, they will never get made and we'll be suck with a large portion of the show unreleased. The cost for 5 season box sets would usally run you around $180 (that $300 less than the whole show on single-disks)