It costs literally millions of $$$ to create a new ASIC (with even the tiniest change from a previous version) which means nobody will do it every six months and nobody would buy ASICs which have such an expiration date.

I think it would be wise to observe first what happens with Monero, i.e. how the HF goes, the network develops and how the market responds. It is entirely possible that they f... up very badly. Let them be the guinea pig this time.