The way I see it, Bcu1525's are really cheap right now (over %50 off retail). As soon as good bitstreams hit the market all of the Bcu1525's and cvp's will be bought up and the price will rise again.
I disagree, based on relative factors.
Today, you can buy a 2080 Ti that will return you just as much as a BCU for a fraction of the price... won't even cost more to run, and will be infinitely more flexible. I'm not saying you should, just pointing out the facts.
To be/stay relevant, a BCU will have to make 2-3 times more than it's doing currently - at today's profitability levels - or else I see zero reason to invest in more.