ASIC for Scrypt is a long ways off, and Scrypt is more resistant to ASICs anyway so we'll see.
If you can do scrypt with an FPGA efficient you can do the same with ASICs. It's only a question of the minimal volume you have to produce/sell.
Unfortunately this is true. You should keep asic on the table even if its cost prohibitive you would want to plan for 2 years away.