It should come as no surprise. West is pricing themselves out of the market. Paul Lomio, Director of the Stanford Law Library explains his rational here.
If this develops into a trend will Lexis see a resurgence of its fortunes? Hmmm. Don't forget that they have all of the Matthew Bender secondary material - a very powerful research tool.
BTW, Lomio's blog, Legal Research Plus, does an excellent job of tracking the fortunes (and misfortunes) of the legal research world.