Anything that gives a boost in players will be beneficial for the size of the pure community. I'm sure it will definitely help out the lpc community.
Depending on whether or not jagex make any of their brainstormed F2P nerfs, it could also keep a number of people in the community who would've elsewise quit due to not wanting to pay for membership.
For what I see, it can only be good news for the longevity of the community.