Law firms are changing. They are moving away from billable hours and towards fixed price contracts. They are making better use of non-partner track lawyers to handle routine stuff, and those lawyers get sane hours and lower salaries.
You're right, some are moving away from billable hours because they have to. However, I haven't heard much about a reduction in working hours. Lots of out of work lawyers and biglaw firms are back to offering 160k+ to summer associates--business as usual but less of it to go around. Non-partner track seems same as it's ever been, except you're less likely to have a job. I'm glad I'm not a lawyer...