Everything says that I can retire in about 5 years' time on an income of about 40k per year. 

I don't want to retire then because: 

1) I want intellectual stimulation and career recognition. And I really don't want to be a second-class citizen like most consultants are / I don't think I've gotten to a level of seniority, relationships and personal renown that I can comfortably rest on my laurels. 

2) I don't think being a full-time parent is something I really want to do, although some additional vacation time would be nice. 

3) I want a lifestyle where I work most of the time in a job that's not too stressful but has some level of impact, a title, health insurance, etc. Which is pretty close, I guess, to what I have now. I need to manage stress and burnout and get back to enjoying the job. 

If this means we are exhausted all the time so be it, this is the configuration, and we just need to bring in more help. 

Anyways, 5 years seems like it's quite close but it's also extremely far away. There is no need to try and talk about theoretical things then. Right now we can only plan about 6 months ahead at a time.