They were $150 from day 1 in Japan, this is just a price reduction. So I doubt we'll ever get the Gamepad separate in the states.
My city has a local Nintendo sponsor repair shop and for a simple screen replacement it's like $55 the labor costs ($25 a hour/but the employees only take $9/hour).
A simple analog swap wouldn't be more than $30 I would say, $5 piece of hardware. You can actually do this yourself, it's rather easy.