Meh, Myler's not going to get any game time anyway.
In fact, I doubt Ford will get much either. There's quite a cyclical problem with being the second-choice England fly-half. Due to a lack of experience, you aren't trusted in the important games. So when games are tight, Farrell is kept on for as long as possible. 70 minutes plus. You only ever come on earlier if England are out of reach, and then you don't have a hard test to prove yourself in. So you don't get the experience. Need experience to get experience.
Compare when Flood was second-choice to when Burns was. Flood got quite a lot of time at the end of games, and even started a few when the form player, because he had the experience. No second-choice fly-half has had that luxury since Flood moved to France.
Hopefully Lancaster will see that by doing this, all of his eggs are in the Farrell basket. Injury or loss of form for Farrell could be England's undoing in the run to the WC. So maybe Lancaster will force himself to pick Ford for a test. Then Ford will have the experience to gain the trust he needs from the England management.
But as far as a third-choice England fly-half goes, they are making up the numbers in case of injury. Myler over Cipriani is probably not going to make a bit of difference in the long-term.