Laser DIRCM sets needed for full coverage of large 777/A330 sized ac are certainly under very active development. Surprisingly (to me at any rate) effective coverage to achieve a high PK against a ManPAD can be achieved with a relatively small number of sites on the a/c.
It's a difficult one. If you fitted them to your airliner, would you be announcing "We protect our passengers better than other airlines" - or "We take you to airports where we need this level of protection!".......