Dosen´t sound very realistic. Bike travel around Europe, backpacking in SA, bike travel to Mongolia and staying in China for 6 months on a budget of 10000€.
And then after your return, what? Living on welfare? In the countries you want to travel, there´s no such thing, if you run out of money, or fall ill (even if you have a travel health insurance, you´ll have to pay on the spot and get the refund later from the insurance company)...

Better do one thing at a time, then plan the next thing, and see how much money is left.
Rule #1: the slower you travel, the cheaper it gets, but nontheless it´s quite a bit of miles to travel, and you´ll need some money.
Did you consider the fares for flights, ferries, helath insurance, petrol and visas?
A year of travel from Europe to Vlad, then to Canada and down to SA by bike cost around 25000 GBP. (depending on your standards).
Rule #2: you´ll always spend more than you planned, and it´s easy to spend money but it´s hard to save money (and evenb harder to earn money).

If you consider earning while on the road, you´ll have to do it in rich countries, where it´s easier to earn money but more expensive to live. Most of the times it dosen´t even pay for your stay, because your standards will rise in those countries.
I don´t say that you couldn´t do it, but my advice would be, that you´d pick one travel at a time, do what you like most first. Your plans will change on that trip anyway. Good luck and happy travels.

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