You do realize that ETC also changed the algo so it is not the same as ETH any more ... so you will need a new asic.  People keep saying its just firmware but ETC now runs a modified dagger hashimoto.  How are you going to change the actual asic chips?  Firmware wont change the asic chips circuitry.  

CORRECTION

Only requires a firmware upgrade to mine ETC. 
ETC did not change the algo enough to cause asics to be unusable.