On one hand what Stormbytes says makes sense for me just to cover my rear in terms of having at least 5 years worth of stock for projects, workshops. But a thousands rolls is a ton of film even for full time use, it took me two years to go through that much Kodachrome.
But this situation with Kodak is as volatile and uncertain as it gets and frankly more distressing than Kodachrome getting nixed. I knew that KR was getting cut at some point years ago because of how archaic it was. While I like HP5, shot a roll this evening in 120, I just know Tri-X really well like a lot of shooters do and love the look and versatility of it.
So I am looking at good amounts of it in 35mm via Freestyle Arista which is great and several hundred rolls of it in 120. Then there are the 100 rolls each of Ektar and Tmax 100 in 120....this is getting expensive and quick....but it is worth the investment.
So I am about $1,500 into covering my rear and can do another 2K before I hit the wall on my annual film budget, 3-3.5K is the best I can do. I will spend that 2K if the crap hits the fan, otherwise I will do like you are saying and simply rotate and replenish stock as needed.