Depends on who you are in "the game".
As a consumer, obviously you would want more growers to reduce prices and increase availability and variety.
As a producer for profit, less growers would be ideal as long as you have a steady source. Making you more $ in the end.
And as a grower for personal use it wouldn't be better or worse, you're happy either way.
In my opinion, I'd like to see more growers. I've been in all three of those positions at one point or another and I can honestly say that more growers is the best thing for US! Don't you love high school economics classes? Taught me how to be the best drug dealer I can be.