Here are some consumer products I would like to see but don't want to build myself (mostly because I prefer working on enterprise instead of consumer products):
1. A better music discovery service. I've tried using Pandora, Spotify, Soundcloud, several radio stations, and other services. But so far none has given a satisfactory answer to "give me songs that are similar to this song". Spotify does an OK job at this, but the same songs keep repeating, and similarity seems to be defined mostly based on artist. But what I want is songs that actually sound similar, not stuff by the same artist. The best solution for me so far has been to search YouTube for mix videos (e.g. chillstep mix) and listen to it. However, constantly searching for new mixes and keeping the YouTube video open is quite annoying. I understand that the space is crowded, but the music discovery problem hasn't been solved at all. At least not for me.
2. A better way to organize my life and habits. I don't use calendar apps because they don't work the way I organize my life. I have my own system, done in a text editor: I have "template list" of tasks and habits such as exercise, meditate, project A, project B, book C, etc, ordered by "priority". These are ties to long-term OKRs. Each of those also has a time span associated with it (30min, etc). I organize my life by week, one file per week. Each weekly file contains all days of that week. I then put the above templates/blocks into the days, planning one week ahead. Many days look similar, defining what I call "habits" (another template). There are no absolute times, just relative times (e.g. tasks that are worth a total of 10h per day). Not having absolute times gives me flexibility in moving stuff around when needed. I manually check off the things that are done each day.
3. Algorithmic healthy meal optimization. I enjoy cooking healthy food and I get recipes from sites such as http://fitmencook.com/. I want to be able to define my intake of certain nutrients (XX protein, YY calories), and the service should give me recipes, minimizing my shopping list for different ingredients. In other words, achieve the right nutrition while buying the minimum amount of different products, making shopping easy and convenient.
4. This one is a bit fuzzy, but if done right I believe it can change the world. Come up with a way to meet "relevant" people (let's say in terms of business or hobbies, but could also be personal) in real life that is not creepy. I believe the key elements are taking away the fear of rejection (e.g. Tinder), semi-anonymity (until all parties mutually agree), taking away friction to initiate something (e.g. people are willing to attend organized events/activities, but not organize something themselves, also due to fear of rejection), overlapping social graph connections, and a way to make it non-creepy. How to put these elements together? I'm not sure, but something is there.