unless all the coins decide to go scrypt N or sha or whatever asic resistant :p
AFAIK scrypt-N is not ASIC resistant, since it is scrypt with different parameters.
To be honest (as Jasinlee mentioned) there is no ASIC resistant algorithm at the moment (and possibly there will never be although this is just my opinion).
The only thing that take to build an ASIC for whatever PoW algorithm is : profitability and ROI.
If it is profitable, then investing in ASIC development is possible.
Will Fibonacci's work with the coins that use "scrypt-N" with the same mixing function as Litecoin ?
I understand that if the mixing function is different (chacha vs salsa) then it won't, am I right ?