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In most cases I don't think that Blizzard can really force guilds to spend less time raiding, though having 25-man instances which could be cleared by decent-but-not-Nihilum/Forte/D&T/rock stars in 2 to 3 hours would definitely allow for more players to experience endgame raiding.
However, the biggest change which would help reduce overall time investment is trash which stays D-E-D dead. Having to re-clear trash, even epic-dropping rep-giving trash, is just too punitive in exchange for a shorter raid. If trash were to stay dead, players with less time to invest could just 'come back tomorrow'.
There's a thread on here somewhere which mentions that the world-first guilds actually spend LESS total time raiding, due to spending an excessive amount of time up front to defeat encounters but making up for it later with a minimal raid schedule for farm content. And even with changes from Blizzard, a dedicated group of players spending more time on an encounter is going to produce faster results (assuming the group doesn't get burnt out).
In conclusion, I don't really think there's a way to reduce the contiguous time needed by raid guilds without radical redesign of endgame raiding by Blizzard.
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