I think it’s good that you recalculated precisely and reflected on it critically. I only partly share your pessimism and wouldn’t postpone everything by 10 years right away. As others have already pointed out, prices will most likely not go down. And saving strictly for 10 years, in addition to paying rent, simply doesn’t yield that much. If saving €15,000 per year were realistic, then you wouldn’t have to worry about the house either. For example, you can also have nice holidays that don’t cost much. Flying and hotels are then rather out of the question; vacation rentals outside the main season (in some destination countries, this also aligns well with holiday times, e.g., Denmark over Pentecost) work well. Campsites can also be very nice and are rarely expensive. My parents went on many holidays with us three children but never spent a lot of money on that.
Yes, it’s not an easy financing, and whether it will work well or not depends heavily on your lifestyle. You can see it in both ways accordingly. The important question here is simply how much your wife will work again. A maximum of 30% will be problematic, as we have already seen. 60% or more would certainly be better, and the children don’t necessarily have to be latchkey kids if you organize well and even have grandparents living nearby. I wouldn’t necessarily fear a big wave of bankruptcies now either. So far, short-time work has successfully prevented large-scale loan defaults, and money will be distributed liberally at least until the next election. The government can’t really afford anything else if they want to be re-elected. And in the time after that, the economy will recover again in the medium term. There will be a time when some sectors will have it somewhat tough, but at the moment, I don’t see a big crisis or sharply falling prices. If that were the case, I wouldn’t build myself but wait until prices go down. A much higher risk I see, however, is that there will be higher inflation rates in the next few years, let’s say around 4-5%, which would help in reducing debts (of the home builders and the states). Of course, you can count on that just as little as on an inheritance, but it definitely should be included in the risk assessment. If that happens, the plans to save up and buy in 10 years are definitely a shot in the dark.