No it wont. It goes more like this:
Month Points Total Points
Month 1 500 Loyalty Points 500 Loyalty Points
Month 2 3,000 Loyalty Points 3,500 Loyalty Points
Month 3 5,000 Loyalty Points 8,500 Loyalty Points
Month 4 7,000 Loyalty Points 15,500 Loyalty Points
Month 5 3,000 Loyalty Points 18,500 Loyalty Points
from the FAQ: http://www.runescape.com/kbase/guid/loyalty_programme_info So it looks like at month 5 it drops. So who knows after that.