Meh, stopped worrying about that for now. Our numbers mean that we can actually find stuff from distributors (every few days a reel or two of parts appear, we buy what we need plus some to set aside for the following order n months from now)
Then there's the fact that what you propose could already be gone by the time he decides to use it, though we are not seeing that recently (it used to be that we had to instant buy, components would disappear in an hour or less)
Availability is also not a problem for single, small quantity hobby project (which from what i understand is the case here)
Bonus: microchip IS less affected than other manufacturers, one of the perks of having their own fabs. Prototype quantities ("samples") are still available AFAIK and their lead times have already started shortening