I guess this question is not for those who are just joining, because, as Dutch Baka san has pointed out, probably extremely few join with a 'plan' in mind regarding length of time they'll purposefully remain an active member.
As for the present then, like all of the above, my thoughts (not really a plan...although that could be considered simply a figure of speech) are that I'll be here until it's not possible, unfruitful, or is altered so much as to not be the JREF it has pretty much always been, more or less. Yes, like Uncle Frank san, I'm married with JREF !