The concept of things like this is excellent, and I don't think that even at massive scale that you could get the average consumer to go along with it, unfortunately. Even if this thing is 30% more expensive than a non-repairable toaster, I bet many consumers would pick the cheaper one, despite it probably not being the long term financially optimal decision. There are valid reasons for it, but even people with means would skip over this, I'd imagine.

I know so many people in my life that can afford the better quality version of something, but instead opt for the cheaper, shittier version. When the shitty one dies, they get a new shitty one. I think it comes down to the short term impact of cost,which is a valid choice if the cost is the main constraint currently, but I repeatedly see this even in cases where the additional cost isn't an issue.

My ranting aside, this is an incredibly cool project and I'd love things like this in my life. Partially for the fact it's repairable and better for the environment, but partially because it's just neat to have a modular version of your household appliances.