Wouldn’t this be bad for parties?

A:

The current system is bad for parties, as voters are deciding not to affiliate in the first place. Almost 50% of voters age 40 and under are unaffiliated, and of newly registered voters in 2014 chose not to affiliated with a party.

Involving more than 1 million independent voters in taxpayer-financed primaries can provide parties and campaigns a new way to engage and identify unaffiliated voters whose values match those of the party and to then work to have them affiliate. 

An AP poll from May found just 12 percent of Republicans think the GOP is very responsive to ordinary voters, while 25 percent of Democrats say the same of their party.