When I reduced my hours, I was amused to notice that everyone from the VP who approved it down to the person in HR who handled the paperwork said they wished they could do the same. I told them all that they could. Most of us in this industry can get by on less, and be happier for it. If you're willing to push for it, any even marginally sane employer will do the calculations for letting you do it vs. hiring a replacement, and make the right decision. Sometimes the paperwork gets a bit messy, but if you show a willingness to work with people on that it can get done - and every person like me who has already gone down this road probably makes it a bit easier for others. In another decade this will be practically normal, just like working from home used to be weird but is now commonplace.