I seem to recall mention of capping it at 8 years. If it's not capped at some point it's even more of a closed shop (mathematically) isn't it?
I haven't seen it specified by the club that it's capped at 8 years, but the fact that they've bothered to specify that it def goes out to 8 years (but no more), the fact that the last 2 years see only a 10 LP pa increase, and that 200 for the last year is a nice round number all lead me to think that their current thinking is that it will be capped at 8.