I know that blake is a near perfect cryptographic algo, but that is not my point!!
ASICs will come (fpga are heavily used already for this algo).
How long do you estimate it will take to develop ASICs for blake? It took years before they were developed for litecoin, and litecoin has been in the top 10 for years. It used to be the number two coin so its ASIC developers were guaranteed a good ROI. Decred has a lower market cap so ASIC developers aren't guaranteed a good ROI if they develop blake ASICs for it.
If I'm not mistaken, Blake implemented in Decred has modifications and is exclusive. An asic for blake will not mining DCR
I believe decred just used fourteen rounds of Blake, nothing really special, just more rounds than Blakecoin or whatever used it previously.
Also, I think technically there are already ASICs that mine Blake. Since X11 had Blake as one of its algorithms, and there are X11 ASICs available, that I believe are at least somewhat customizable because I believe these same ASICs can mine quark and qubit as well, it isn't that far out to think these existing ASICs could already be mining decred.