I do admit I hoard the series 70 engine with good reason, I will never need one of those new age machines in my lifetime, I might sell a few but guaranteed to always have a 2stroke available for myself.
I give it less than 2 years before they phase them out completely, then parts will get harder to get, but if they say parts arent available, a company technically has to have spares available for something like 7 years after it was made. A mate recently had this trouble with a line trimmer, and got a whole new machine outof it.